diff --git a/common/design_block_info.cpp b/common/design_block_info.cpp
index 55aedb95ec..10c3582047 100644
--- a/common/design_block_info.cpp
+++ b/common/design_block_info.cpp
@@ -37,7 +37,6 @@
 #include <utility>
 #include <wx/tokenzr.h>
 #include <kiface_base.h>
-#include <locale_io.h>
 
 DESIGN_BLOCK_INFO* DESIGN_BLOCK_LIST::GetDesignBlockInfo( const wxString& aLibNickname,
                                                           const wxString& aDesignBlockName )
diff --git a/common/design_block_info.h b/common/design_block_info.h
index 4816438681..20070bea17 100644
--- a/common/design_block_info.h
+++ b/common/design_block_info.h
@@ -42,7 +42,6 @@ class DESIGN_BLOCK_LIST_IMPL;
 class PROGRESS_REPORTER;
 class wxTopLevelWindow;
 class KIWAY;
-class LOCALE_IO;
 class wxTextFile;
 
 
@@ -114,7 +113,7 @@ protected:
     }
 
     /// lazily load stuff not filled in by constructor.  This may throw IO_ERRORS.
-    virtual void load( const LOCALE_IO* locale = nullptr ) {};
+    virtual void load() {};
 
 protected:
     DESIGN_BLOCK_LIST* m_owner;    ///< provides access to DESIGN_BLOCK_LIB_TABLE
diff --git a/common/design_block_info_impl.cpp b/common/design_block_info_impl.cpp
index 4fcaa1cfc1..2ff96ad5b9 100644
--- a/common/design_block_info_impl.cpp
+++ b/common/design_block_info_impl.cpp
@@ -23,7 +23,6 @@
 #include <design_block.h>
 #include <design_block_lib_table.h>
 #include <kiway.h>
-#include <locale_io.h>
 #include <progress_reporter.h>
 #include <string_utils.h>
 #include <thread_pool.h>
@@ -35,14 +34,13 @@
 #include <wx/wfstream.h>
 
 
-void DESIGN_BLOCK_INFO_IMPL::load( const LOCALE_IO* locale )
+void DESIGN_BLOCK_INFO_IMPL::load()
 {
     DESIGN_BLOCK_LIB_TABLE* dbtable = m_owner->GetTable();
 
     wxASSERT( dbtable );
 
-    std::unique_ptr<const DESIGN_BLOCK> design_block( dbtable->GetEnumeratedDesignBlock( m_nickname, m_dbname,
-                                                                                         locale ) );
+    std::unique_ptr<const DESIGN_BLOCK> design_block( dbtable->GetEnumeratedDesignBlock( m_nickname, m_dbname ) );
 
     if( design_block )
     {
@@ -148,14 +146,7 @@ bool DESIGN_BLOCK_LIST_IMPL::ReadDesignBlockFiles( DESIGN_BLOCK_LIB_TABLE* aTabl
 
 void DESIGN_BLOCK_LIST_IMPL::loadDesignBlocks()
 {
-    LOCALE_IO toggle_locale;
-
-    // Parse the design_blocks in parallel. WARNING! This requires changing the locale, which is
-    // GLOBAL. It is only thread safe to construct the LOCALE_IO before the threads are created,
-    // destroy it after they finish, and block the main (GUI) thread while they work. Any deviation
-    // from this will cause nasal demons.
-    //
-    // TODO: blast LOCALE_IO into the sun
+    // Parse the design_blocks in parallel.
 
     SYNC_QUEUE<std::unique_ptr<DESIGN_BLOCK_INFO>> queue_parsed;
 
@@ -164,7 +155,7 @@ void DESIGN_BLOCK_LIST_IMPL::loadDesignBlocks()
     std::vector<std::future<size_t>> returns( num_elements );
 
     auto db_thread =
-            [ this, &queue_parsed, &toggle_locale ]() -> size_t
+            [ this, &queue_parsed ]() -> size_t
             {
                 wxString nickname;
 
@@ -176,7 +167,7 @@ void DESIGN_BLOCK_LIST_IMPL::loadDesignBlocks()
                 CatchErrors(
                         [&]()
                         {
-                            m_lib_table->DesignBlockEnumerate( dbnames, nickname, false, &toggle_locale );
+                            m_lib_table->DesignBlockEnumerate( dbnames, nickname, false );
                         } );
 
                 for( wxString dbname : dbnames )
@@ -184,7 +175,7 @@ void DESIGN_BLOCK_LIST_IMPL::loadDesignBlocks()
                     CatchErrors(
                             [&]()
                             {
-                                auto* dbinfo = new DESIGN_BLOCK_INFO_IMPL( this, nickname, dbname, &toggle_locale );
+                                auto* dbinfo = new DESIGN_BLOCK_INFO_IMPL( this, nickname, dbname );
                                 queue_parsed.move_push( std::unique_ptr<DESIGN_BLOCK_INFO>( dbinfo ) );
                             } );
 
diff --git a/common/design_block_info_impl.h b/common/design_block_info_impl.h
index cdc2b55b5b..423b8aba91 100644
--- a/common/design_block_info_impl.h
+++ b/common/design_block_info_impl.h
@@ -30,13 +30,11 @@
 #include <design_block_info.h>
 #include <core/sync_queue.h>
 
-class LOCALE_IO;
-
 class KICOMMON_API DESIGN_BLOCK_INFO_IMPL : public DESIGN_BLOCK_INFO
 {
 public:
     DESIGN_BLOCK_INFO_IMPL( DESIGN_BLOCK_LIST* aOwner, const wxString& aNickname,
-                            const wxString& aDesignBlockName, const LOCALE_IO* aLocale )
+                            const wxString& aDesignBlockName )
     {
         m_nickname = aNickname;
         m_dbname = aDesignBlockName;
@@ -44,7 +42,7 @@ public:
 
         m_owner = aOwner;
         m_loaded = false;
-        load( aLocale );
+        load();
     }
 
     // A constructor for cached items
@@ -73,7 +71,7 @@ public:
     }
 
 protected:
-    virtual void load( const LOCALE_IO* aLocale = nullptr ) override;
+    virtual void load() override;
 };
 
 
diff --git a/common/design_block_lib_table.cpp b/common/design_block_lib_table.cpp
index a1d07351c7..466922e5ca 100644
--- a/common/design_block_lib_table.cpp
+++ b/common/design_block_lib_table.cpp
@@ -39,7 +39,6 @@
 
 #include <wx/dir.h>
 #include <wx/hash.h>
-#include <locale_io.h>
 
 #define OPT_SEP '|' ///< options separator character
 
@@ -334,23 +333,13 @@ long long DESIGN_BLOCK_LIB_TABLE::GenerateTimestamp( const wxString* aNickname )
 
 
 void DESIGN_BLOCK_LIB_TABLE::DesignBlockEnumerate( wxArrayString&  aDesignBlockNames, const wxString& aNickname,
-                                                   bool aBestEfforts, const LOCALE_IO* aLocale )
+                                                   bool aBestEfforts )
 {
     const DESIGN_BLOCK_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
-    if( !aLocale )
-    {
-        LOCALE_IO toggle_locale;
-
-        row->plugin->DesignBlockEnumerate( aDesignBlockNames, row->GetFullURI( true ), aBestEfforts,
-                                           row->GetProperties() );
-    }
-    else
-    {
-        row->plugin->DesignBlockEnumerate( aDesignBlockNames, row->GetFullURI( true ), aBestEfforts,
-                                           row->GetProperties() );
-    }
+    row->plugin->DesignBlockEnumerate( aDesignBlockNames, row->GetFullURI( true ), aBestEfforts,
+                                        row->GetProperties() );
 }
 
 
@@ -401,34 +390,19 @@ static void setLibNickname( DESIGN_BLOCK* aModule, const wxString& aNickname,
 
 const DESIGN_BLOCK*
 DESIGN_BLOCK_LIB_TABLE::GetEnumeratedDesignBlock( const wxString& aNickname,
-                                                  const wxString& aDesignBlockName,
-                                                  const LOCALE_IO* aLocale )
+                                                  const wxString& aDesignBlockName )
 {
     const DESIGN_BLOCK_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
-    if( !aLocale )
-    {
-        LOCALE_IO toggle_locale;
-
-        return row->plugin->GetEnumeratedDesignBlock( row->GetFullURI( true ), aDesignBlockName,
-                                                      row->GetProperties() );
-    }
-    else
-    {
-        return row->plugin->GetEnumeratedDesignBlock( row->GetFullURI( true ), aDesignBlockName,
-                                                      row->GetProperties() );
-    }
+    return row->plugin->GetEnumeratedDesignBlock( row->GetFullURI( true ), aDesignBlockName,
+                                                    row->GetProperties() );
 }
 
 
 bool DESIGN_BLOCK_LIB_TABLE::DesignBlockExists( const wxString& aNickname,
                                                 const wxString& aDesignBlockName )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     try
     {
         const DESIGN_BLOCK_LIB_TABLE_ROW* row = FindRow( aNickname, true );
@@ -448,10 +422,6 @@ DESIGN_BLOCK* DESIGN_BLOCK_LIB_TABLE::DesignBlockLoad( const wxString& aNickname
                                                        const wxString& aDesignBlockName,
                                                        bool            aKeepUUID )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     const DESIGN_BLOCK_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
@@ -468,10 +438,6 @@ DESIGN_BLOCK_LIB_TABLE::SAVE_T
 DESIGN_BLOCK_LIB_TABLE::DesignBlockSave( const wxString&     aNickname,
                                          const DESIGN_BLOCK* aDesignBlock, bool aOverwrite )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     const DESIGN_BLOCK_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
diff --git a/common/footprint_info.cpp b/common/footprint_info.cpp
index 933c2e98ab..25ef8465b1 100644
--- a/common/footprint_info.cpp
+++ b/common/footprint_info.cpp
@@ -39,7 +39,6 @@
 #include <utility>
 #include <wx/tokenzr.h>
 #include <kiface_base.h>
-#include <locale_io.h>
 
 FOOTPRINT_INFO* FOOTPRINT_LIST::GetFootprintInfo( const wxString& aLibNickname,
                                                   const wxString& aFootprintName )
diff --git a/common/fp_lib_table.cpp b/common/fp_lib_table.cpp
index 4d428728e7..789783b12d 100644
--- a/common/fp_lib_table.cpp
+++ b/common/fp_lib_table.cpp
@@ -40,7 +40,6 @@
 
 #include <wx/dir.h>
 #include <wx/hash.h>
-#include <locale_io.h>
 
 #define OPT_SEP     '|'         ///< options separator character
 
@@ -313,23 +312,13 @@ long long FP_LIB_TABLE::GenerateTimestamp( const wxString* aNickname )
 
 
 void FP_LIB_TABLE::FootprintEnumerate( wxArrayString& aFootprintNames, const wxString& aNickname,
-                                       bool aBestEfforts, const LOCALE_IO* aLocale )
+                                       bool aBestEfforts )
 {
     const FP_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
-    if( !aLocale )
-    {
-        LOCALE_IO toggle_locale;
-
-        row->plugin->FootprintEnumerate( aFootprintNames, row->GetFullURI( true ), aBestEfforts,
-                                         row->GetProperties() );
-    }
-    else
-    {
-        row->plugin->FootprintEnumerate( aFootprintNames, row->GetFullURI( true ), aBestEfforts,
-                                         row->GetProperties() );
-    }
+    row->plugin->FootprintEnumerate( aFootprintNames, row->GetFullURI( true ), aBestEfforts,
+                                        row->GetProperties() );
 }
 
 
@@ -379,33 +368,18 @@ static void setLibNickname( FOOTPRINT* aModule, const wxString& aNickname,
 
 
 const FOOTPRINT* FP_LIB_TABLE::GetEnumeratedFootprint( const wxString& aNickname,
-                                                       const wxString& aFootprintName,
-                                                       const LOCALE_IO* aLocale )
+                                                       const wxString& aFootprintName )
 {
     const FP_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
-    if( !aLocale )
-    {
-        LOCALE_IO toggle_locale;
-
-        return row->plugin->GetEnumeratedFootprint( row->GetFullURI( true ), aFootprintName,
-                                                    row->GetProperties() );
-    }
-    else
-    {
-        return row->plugin->GetEnumeratedFootprint( row->GetFullURI( true ), aFootprintName,
-                                                    row->GetProperties() );
-    }
+    return row->plugin->GetEnumeratedFootprint( row->GetFullURI( true ), aFootprintName,
+                                                row->GetProperties() );
 }
 
 
 bool FP_LIB_TABLE::FootprintExists( const wxString& aNickname, const wxString& aFootprintName )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     try
     {
         const FP_LIB_TABLE_ROW* row = FindRow( aNickname, true );
@@ -424,10 +398,6 @@ bool FP_LIB_TABLE::FootprintExists( const wxString& aNickname, const wxString& a
 FOOTPRINT* FP_LIB_TABLE::FootprintLoad( const wxString& aNickname,
                                         const wxString& aFootprintName, bool aKeepUUID )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     const FP_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
@@ -443,10 +413,6 @@ FOOTPRINT* FP_LIB_TABLE::FootprintLoad( const wxString& aNickname,
 FP_LIB_TABLE::SAVE_T FP_LIB_TABLE::FootprintSave( const wxString& aNickname,
                                                   const FOOTPRINT* aFootprint, bool aOverwrite )
 {
-    // NOT THREAD-SAFE!  LOCALE_IO is global!
-
-    LOCALE_IO toggle_locale;
-
     const FP_LIB_TABLE_ROW* row = FindRow( aNickname, true );
     wxASSERT( row->plugin );
 
diff --git a/eeschema/sch_io/eagle/sch_io_eagle.cpp b/eeschema/sch_io/eagle/sch_io_eagle.cpp
index a72dad4a0f..fedf145103 100644
--- a/eeschema/sch_io/eagle/sch_io_eagle.cpp
+++ b/eeschema/sch_io/eagle/sch_io_eagle.cpp
@@ -24,8 +24,6 @@
 
 #include <sch_io/eagle/sch_io_eagle.h>
 
-#include <locale_io.h>
-
 #include <algorithm>
 #include <memory>
 #include <wx/filename.h>
@@ -351,7 +349,6 @@ SCH_SHEET* SCH_IO_EAGLE::LoadSchematicFile( const wxString& aFileName, SCHEMATIC
                                             const std::map<std::string, UTF8>* aProperties )
 {
     wxASSERT( !aFileName || aSchematic != nullptr );
-    LOCALE_IO toggle; // toggles on, then off, the C locale.
 
     // Show the font substitution warnings
     fontconfig::FONTCONFIG::SetReporter( &WXLOG_REPORTER::GetInstance() );
@@ -559,8 +556,6 @@ void SCH_IO_EAGLE::ensureLoadedLibrary( const wxString& aLibraryPath )
             return;
     }
 
-    LOCALE_IO toggle; // toggles on, then off, the C locale.
-
     if( m_progressReporter )
     {
         m_progressReporter->Report( wxString::Format( _( "Loading %s..." ), aLibraryPath ) );
diff --git a/eeschema/sch_io/kicad_legacy/sch_io_kicad_legacy.cpp b/eeschema/sch_io/kicad_legacy/sch_io_kicad_legacy.cpp
index 7ff4913a56..551ae46b96 100644
--- a/eeschema/sch_io/kicad_legacy/sch_io_kicad_legacy.cpp
+++ b/eeschema/sch_io/kicad_legacy/sch_io_kicad_legacy.cpp
@@ -37,7 +37,6 @@
 #include <fmt/format.h>
 #include <kiway.h>
 #include <string_utils.h>
-#include <locale_io.h>
 #include <richio.h>
 #include <trace_helpers.h>
 #include <trigo.h>
@@ -130,9 +129,7 @@ SCH_SHEET* SCH_IO_KICAD_LEGACY::LoadSchematicFile( const wxString& aFileName, SC
 {
     wxASSERT( !aFileName || aSchematic != nullptr );
 
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
     SCH_SHEET*  sheet;
-
     wxFileName fn = aFileName;
 
     // Unfortunately child sheet file names the legacy schematic file format are not fully
@@ -1502,8 +1499,6 @@ void SCH_IO_KICAD_LEGACY::SaveSchematicFile( const wxString& aFileName, SCH_SHEE
     wxCHECK_RET( aSheet != nullptr, "NULL SCH_SHEET object." );
     wxCHECK_RET( !aFileName.IsEmpty(), "No schematic file name defined." );
 
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale, to write floating point values.
-
     init( aSchematic, aProperties );
 
     wxFileName fn = aFileName;
@@ -1804,7 +1799,7 @@ void SCH_IO_KICAD_LEGACY::saveBitmap( const SCH_BITMAP& aBitmap )
     m_out->Print( 0, "Pos %-4d %-4d\n",
                   schIUScale.IUToMils( aBitmap.GetPosition().x ),
                   schIUScale.IUToMils( aBitmap.GetPosition().y ) );
-    m_out->Print( "%s", fmt::format("Scale {:g}\n atof", refImage.GetImageScale()).c_str() );
+    m_out->Print( "%s", fmt::format("Scale {:g}\n", refImage.GetImageScale()).c_str() );
     m_out->Print( 0, "Data\n" );
 
     wxMemoryOutputStream stream;
@@ -2123,8 +2118,6 @@ void SCH_IO_KICAD_LEGACY::EnumerateSymbolLib( wxArrayString&    aSymbolNameList,
                                               const wxString&   aLibraryPath,
                                               const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     bool powerSymbolsOnly = ( aProperties &&
                               aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );
 
@@ -2144,8 +2137,6 @@ void SCH_IO_KICAD_LEGACY::EnumerateSymbolLib( std::vector<LIB_SYMBOL*>& aSymbolL
                                               const wxString&   aLibraryPath,
                                             const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     bool powerSymbolsOnly = ( aProperties &&
                               aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );
 
@@ -2165,8 +2156,6 @@ LIB_SYMBOL* SCH_IO_KICAD_LEGACY::LoadSymbol( const wxString& aLibraryPath,
                                              const wxString& aSymbolName,
                                              const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     LIB_SYMBOL_MAP::const_iterator it = m_cache->m_symbols.find( aSymbolName );
@@ -2181,8 +2170,6 @@ LIB_SYMBOL* SCH_IO_KICAD_LEGACY::LoadSymbol( const wxString& aLibraryPath,
 void SCH_IO_KICAD_LEGACY::SaveSymbol( const wxString& aLibraryPath, const LIB_SYMBOL* aSymbol,
                                       const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     m_cache->AddSymbol( aSymbol );
@@ -2195,8 +2182,6 @@ void SCH_IO_KICAD_LEGACY::SaveSymbol( const wxString& aLibraryPath, const LIB_SY
 void SCH_IO_KICAD_LEGACY::DeleteSymbol( const wxString& aLibraryPath, const wxString& aSymbolName,
                                         const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     m_cache->DeleteSymbol( aSymbolName );
@@ -2215,8 +2200,6 @@ void SCH_IO_KICAD_LEGACY::CreateLibrary( const wxString& aLibraryPath,
                                           aLibraryPath.GetData() ) );
     }
 
-    LOCALE_IO toggle;
-
     delete m_cache;
     m_cache = new SCH_IO_KICAD_LEGACY_LIB_CACHE( aLibraryPath );
     m_cache->SetModified();
diff --git a/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr.cpp b/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr.cpp
index b2d08d7d3d..f8ef30cc52 100644
--- a/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr.cpp
+++ b/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr.cpp
@@ -33,7 +33,6 @@
 #include <sch_selection.h>
 #include <font/fontconfig.h>
 #include <io/kicad/kicad_io_utils.h>
-#include <locale_io.h>
 #include <progress_reporter.h>
 #include <schematic.h>
 #include <schematic_lexer.h>
@@ -101,7 +100,6 @@ SCH_SHEET* SCH_IO_KICAD_SEXPR::LoadSchematicFile( const wxString& aFileName, SCH
 {
     wxASSERT( !aFileName || aSchematic != nullptr );
 
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
     SCH_SHEET*  sheet;
 
     wxFileName fn = aFileName;
@@ -324,7 +322,6 @@ void SCH_IO_KICAD_SEXPR::LoadContent( LINE_READER& aReader, SCH_SHEET* aSheet, i
 {
     wxCHECK( aSheet, /* void */ );
 
-    LOCALE_IO toggle;
     SCH_IO_KICAD_SEXPR_PARSER parser( &aReader );
 
     parser.ParseSchematic( aSheet, true, aFileVersion );
@@ -338,8 +335,6 @@ void SCH_IO_KICAD_SEXPR::SaveSchematicFile( const wxString& aFileName, SCH_SHEET
     wxCHECK_RET( aSheet != nullptr, "NULL SCH_SHEET object." );
     wxCHECK_RET( !aFileName.IsEmpty(), "No schematic file name defined." );
 
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale, to write floating point values.
-
     wxString sanityResult = aSheet->GetScreen()->GroupsSanityCheck();
 
     if( sanityResult != wxEmptyString && m_queryUserCallback )
@@ -520,7 +515,6 @@ void SCH_IO_KICAD_SEXPR::Format( SCH_SELECTION* aSelection, SCH_SHEET_PATH* aSel
 {
     wxCHECK( aSelection && aSelectionPath && aFormatter, /* void */ );
 
-    LOCALE_IO toggle;
     SCH_SHEET_LIST sheets = aSchematic.Hierarchy();
 
     m_schematic = &aSchematic;
@@ -1583,8 +1577,6 @@ void SCH_IO_KICAD_SEXPR::EnumerateSymbolLib( wxArrayString&    aSymbolNameList,
                                              const wxString&   aLibraryPath,
                                              const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     bool powerSymbolsOnly = ( aProperties &&
                               aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );
 
@@ -1604,8 +1596,6 @@ void SCH_IO_KICAD_SEXPR::EnumerateSymbolLib( std::vector<LIB_SYMBOL*>& aSymbolLi
                                              const wxString&   aLibraryPath,
                                              const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     bool powerSymbolsOnly = ( aProperties &&
                               aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );
 
@@ -1625,8 +1615,6 @@ LIB_SYMBOL* SCH_IO_KICAD_SEXPR::LoadSymbol( const wxString& aLibraryPath,
                                             const wxString& aSymbolName,
                                             const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     LIB_SYMBOL_MAP::const_iterator it = m_cache->m_symbols.find( aSymbolName );
@@ -1652,8 +1640,6 @@ LIB_SYMBOL* SCH_IO_KICAD_SEXPR::LoadSymbol( const wxString& aLibraryPath,
 void SCH_IO_KICAD_SEXPR::SaveSymbol( const wxString& aLibraryPath, const LIB_SYMBOL* aSymbol,
                                      const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     m_cache->AddSymbol( aSymbol );
@@ -1666,8 +1652,6 @@ void SCH_IO_KICAD_SEXPR::SaveSymbol( const wxString& aLibraryPath, const LIB_SYM
 void SCH_IO_KICAD_SEXPR::DeleteSymbol( const wxString& aLibraryPath, const wxString& aSymbolName,
                                        const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
-
     cacheLib( aLibraryPath, aProperties );
 
     m_cache->DeleteSymbol( aSymbolName );
@@ -1686,8 +1670,6 @@ void SCH_IO_KICAD_SEXPR::CreateLibrary( const wxString& aLibraryPath,
                                           aLibraryPath.GetData() ) );
     }
 
-    LOCALE_IO toggle;
-
     delete m_cache;
     m_cache = new SCH_IO_KICAD_SEXPR_LIB_CACHE( aLibraryPath );
     m_cache->SetModified();
@@ -1802,7 +1784,6 @@ std::vector<LIB_SYMBOL*> SCH_IO_KICAD_SEXPR::ParseLibSymbols( std::string& aSymb
                                                               std::string  aSource,
                                                               int aFileVersion )
 {
-    LOCALE_IO      toggle;     // toggles on, then off, the C locale.
     LIB_SYMBOL*    newSymbol = nullptr;
     LIB_SYMBOL_MAP map;
 
@@ -1829,7 +1810,6 @@ std::vector<LIB_SYMBOL*> SCH_IO_KICAD_SEXPR::ParseLibSymbols( std::string& aSymb
 
 void SCH_IO_KICAD_SEXPR::FormatLibSymbol( LIB_SYMBOL* symbol, OUTPUTFORMATTER & formatter )
 {
-    LOCALE_IO toggle;     // toggles on, then off, the C locale.
     SCH_IO_KICAD_SEXPR_LIB_CACHE::SaveSymbol( symbol, formatter );
 }
 
diff --git a/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr_lib_cache.cpp b/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr_lib_cache.cpp
index 40cc101f18..3de31b953f 100644
--- a/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr_lib_cache.cpp
+++ b/eeschema/sch_io/kicad_sexpr/sch_io_kicad_sexpr_lib_cache.cpp
@@ -28,7 +28,6 @@
 #include <sch_shape.h>
 #include <lib_symbol.h>
 #include <sch_textbox.h>
-#include <locale_io.h>
 #include <macros.h>
 #include <richio.h>
 #include "sch_io_kicad_sexpr_lib_cache.h"
@@ -63,10 +62,6 @@ void SCH_IO_KICAD_SEXPR_LIB_CACHE::Load()
                  wxString::Format( "Cannot use relative file paths in sexpr plugin to "
                                    "open library '%s'.", m_libFileName.GetFullPath() ) );
 
-    // The current locale must use period as the decimal point.
-    // Yes, we did this earlier, but it's sadly not thread-safe.
-    LOCALE_IO toggle;
-
     wxLogTrace( traceSchLegacyPlugin, "Loading sexpr symbol library file '%s'",
                 m_libFileName.GetFullPath() );
 
@@ -89,8 +84,6 @@ void SCH_IO_KICAD_SEXPR_LIB_CACHE::Save( const std::optional<bool>& aOpt )
     if( !m_isModified )
         return;
 
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     // Write through symlinks, don't replace them.
     wxFileName fn = GetRealFile();
 
@@ -139,11 +132,6 @@ void SCH_IO_KICAD_SEXPR_LIB_CACHE::SaveSymbol( LIB_SYMBOL* aSymbol, OUTPUTFORMAT
 {
     wxCHECK_RET( aSymbol, "Invalid LIB_SYMBOL pointer." );
 
-    // The current locale must use period as the decimal point.
-    wxCHECK2( wxLocale::GetInfo( wxLOCALE_DECIMAL_POINT, wxLOCALE_CAT_NUMBER ) == ".",
-              LOCALE_IO toggle );
-
-
     // If we've requested to embed the fonts in the symbol, do so.
     // Otherwise, clear the embedded fonts from the symbol.  Embedded
     // fonts will be used if available
diff --git a/gerbview/excellon_read_drill_file.cpp b/gerbview/excellon_read_drill_file.cpp
index 033daa2186..4933892278 100644
--- a/gerbview/excellon_read_drill_file.cpp
+++ b/gerbview/excellon_read_drill_file.cpp
@@ -74,7 +74,6 @@
 #include <macros.h>
 #include <richio.h>
 #include <string_utils.h>
-#include <locale_io.h>
 #include <X2_gerber_attributes.h>
 #include <view/view.h>
 #include <gerbview_settings.h>
@@ -481,8 +480,6 @@ bool EXCELLON_IMAGE::LoadFile( const wxString & aFullFileName, EXCELLON_DEFAULTS
     wxString msg;
     m_FileName = aFullFileName;
 
-    LOCALE_IO toggleIo;
-
     // FILE_LINE_READER will close the file.
     FILE_LINE_READER excellonReader( m_Current_File, m_FileName );
 
diff --git a/gerbview/export_to_pcbnew.cpp b/gerbview/export_to_pcbnew.cpp
index 549c613cc5..a2bb4b3ca8 100644
--- a/gerbview/export_to_pcbnew.cpp
+++ b/gerbview/export_to_pcbnew.cpp
@@ -28,7 +28,6 @@
 
 #include <confirm.h>
 #include <string_utils.h>
-#include <locale_io.h>
 #include <lset.h>
 #include <macros.h>
 #include <trigo.h>
@@ -57,8 +56,6 @@ GBR_TO_PCB_EXPORTER::~GBR_TO_PCB_EXPORTER()
 
 bool GBR_TO_PCB_EXPORTER::ExportPcb( const int* aLayerLookUpTable, int aCopperLayers )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     m_fp = wxFopen( m_pcb_file_name, wxT( "wt" ) );
 
     if( m_fp == nullptr )
diff --git a/gerbview/job_file_reader.cpp b/gerbview/job_file_reader.cpp
index 3dfe193b2c..6ae5231cd0 100644
--- a/gerbview/job_file_reader.cpp
+++ b/gerbview/job_file_reader.cpp
@@ -32,7 +32,6 @@
 #include <wildcards_and_files_ext.h>
 #include <gerbview.h>
 #include <richio.h>
-#include <locale_io.h>
 #include <string_utils.h>
 #include <gerber_file_image.h>
 #include <gerber_file_image_list.h>
@@ -111,8 +110,6 @@ bool GERBER_JOBFILE_READER::ReadGerberJobFile()
     if( jobFile == nullptr )
         return false;
 
-    LOCALE_IO toggleIo;
-
     FILE_LINE_READER jobfileReader( jobFile, m_filename.GetFullPath() );  // Will close jobFile
 
     wxString data;
diff --git a/gerbview/readgerb.cpp b/gerbview/readgerb.cpp
index f44f2a0537..3af5297592 100644
--- a/gerbview/readgerb.cpp
+++ b/gerbview/readgerb.cpp
@@ -24,7 +24,6 @@
 
 #include "ki_exception.h"
 #include <string_utils.h>
-#include <locale_io.h>
 #include <gerbview.h>
 #include <gerbview_frame.h>
 #include <gerber_file_image.h>
@@ -245,8 +244,6 @@ bool GERBER_FILE_IMAGE::LoadGerberFile( const wxString& aFullFileName )
 
     m_FileName = aFullFileName;
 
-    LOCALE_IO toggleIo;
-
     wxString msg;
 
     while( true )
diff --git a/gerbview/rs274_read_XY_and_IJ_coordinates.cpp b/gerbview/rs274_read_XY_and_IJ_coordinates.cpp
index a379095667..8de3542f0b 100644
--- a/gerbview/rs274_read_XY_and_IJ_coordinates.cpp
+++ b/gerbview/rs274_read_XY_and_IJ_coordinates.cpp
@@ -114,7 +114,9 @@ VECTOR2I GERBER_FILE_IMAGE::ReadXYCoord( char*& aText, bool aExcellonMode )
             line.push_back( *( aText++ ) );
         }
 
-        double val = strtod( line.data(), nullptr );
+        double val;
+        wxString text( line.data() );
+        text.ToCDouble( &val );
 
         if( is_float )
         {
@@ -202,7 +204,10 @@ VECTOR2I GERBER_FILE_IMAGE::ReadIJCoord( char*& aText )
             line.push_back( *( aText++ ) );
         }
 
-        double val = strtod( line.data(), nullptr );
+        double val;
+        wxString text( line.data() );
+        text.Trim( true ).Trim( false );
+        text.ToCDouble( &val );
 
         if( is_float )
         {
@@ -314,7 +319,21 @@ double ReadDouble( char*& text, bool aSkipSeparator = true )
     }
     else
     {
-        ret = strtod( text, &text );
+        wxString line( text );
+        auto endpos = line.find_first_not_of( "0123456789.-+eE" );
+        line.Trim( false );
+        line.ToCDouble( &ret );
+
+        if( endpos != wxString::npos )
+        {
+            // Advance the text pointer to the end of the number
+            text += endpos;
+        }
+        else
+        {
+            // If no non-number characters found, advance to the end of the string
+            text += line.length();
+        }
     }
 
     if( *text == ',' || isspace( *text ) )
diff --git a/include/design_block_lib_table.h b/include/design_block_lib_table.h
index d951d07d62..68a7bcd6c6 100644
--- a/include/design_block_lib_table.h
+++ b/include/design_block_lib_table.h
@@ -158,13 +158,11 @@ public:
      *                          \a aNickname.
      * @param aNickname is a locator for the "library", it is a "name" in LIB_TABLE_ROW.
      * @param aBestEfforts if true, don't throw on errors.
-     * @param aLocale a previously set-up locale.  Currently required for multi-threading, as LOCALE_IO
-     *                uses global storage.
      *
      * @throw IO_ERROR if the library cannot be found, or design block cannot be loaded.
      */
     void DesignBlockEnumerate( wxArrayString& aDesignBlockNames, const wxString& aNickname,
-                               bool aBestEfforts, const LOCALE_IO* aLocale = nullptr );
+                               bool aBestEfforts );
 
     /**
      * Generate a hashed timestamp representing the last-mod-times of the library indicated
@@ -202,8 +200,7 @@ public:
      *
      * The return value is const to allow it to return a reference to a cached item.
      */
-    const DESIGN_BLOCK* GetEnumeratedDesignBlock( const wxString& aNickname, const wxString& aDesignBlockName,
-                                                  const LOCALE_IO* aLocale = nullptr );
+    const DESIGN_BLOCK* GetEnumeratedDesignBlock( const wxString& aNickname, const wxString& aDesignBlockName );
     /**
      * The set of return values from DesignBlockSave() below.
      */
diff --git a/include/footprint_info.h b/include/footprint_info.h
index e8e0f5f73f..cc15c0a768 100644
--- a/include/footprint_info.h
+++ b/include/footprint_info.h
@@ -46,7 +46,6 @@ class FOOTPRINT_LIST_IMPL;
 class PROGRESS_REPORTER;
 class wxTopLevelWindow;
 class KIWAY;
-class LOCALE_IO;
 class wxTextFile;
 
 
@@ -135,7 +134,7 @@ protected:
     }
 
     /// lazily load stuff not filled in by constructor.  This may throw IO_ERRORS.
-    virtual void load( const LOCALE_IO* aLocale = nullptr ) { };
+    virtual void load() { };
 
     FOOTPRINT_LIST* m_owner; ///< provides access to FP_LIB_TABLE
 
diff --git a/include/fp_lib_table.h b/include/fp_lib_table.h
index 7f8a49d34f..8f355eebd2 100644
--- a/include/fp_lib_table.h
+++ b/include/fp_lib_table.h
@@ -32,7 +32,6 @@
 class FOOTPRINT;
 class FP_LIB_TABLE_GRID;
 class PCB_IO;
-class LOCALE_IO;
 
 
 /**
@@ -144,13 +143,11 @@ public:
      * @param aFootprintNames is the list to fill with the footprint names found in \a aNickname
      * @param aNickname is a locator for the "library", it is a "name" in LIB_TABLE_ROW.
      * @param aBestEfforts if true, don't throw on errors.
-     * @param aLocale a previously set-up locale.  Currently required for multi-threading, as LOCALE_IO
-     *                uses global storage.
      *
      * @throw IO_ERROR if the library cannot be found, or footprint cannot be loaded.
      */
     void FootprintEnumerate( wxArrayString& aFootprintNames, const wxString& aNickname,
-                             bool aBestEfforts, const LOCALE_IO* aLocale = nullptr );
+                             bool aBestEfforts );
 
     /**
      * Generate a hashed timestamp representing the last-mod-times of the library indicated
@@ -183,14 +180,10 @@ public:
      * A version of #FootprintLoad() for use after #FootprintEnumerate() for more efficient
      * cache management.
      *
-     * @param aLocale a previously set-up locale.  Currently required for multi-threading, as LOCALE_IO
-     *                uses global storage.
-     *
      * The return value is const to allow it to return a reference to a cached item.
      */
     const FOOTPRINT* GetEnumeratedFootprint( const wxString& aNickname,
-                                             const wxString& aFootprintName,
-                                             const LOCALE_IO* aLocale = nullptr );
+                                             const wxString& aFootprintName );
     /**
      * The set of return values from FootprintSave() below.
      */
diff --git a/pcb_calculator/datafile_read_write.cpp b/pcb_calculator/datafile_read_write.cpp
index 9f3995db15..2556182d08 100644
--- a/pcb_calculator/datafile_read_write.cpp
+++ b/pcb_calculator/datafile_read_write.cpp
@@ -22,6 +22,8 @@
  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <fmt/format.h>
+
 #include <wx/app.h>
 #include <wx/msgdlg.h>
 
@@ -30,7 +32,6 @@
 #include <class_regulator_data.h>
 #include <datafile_read_write.h>
 #include <string_utils.h>
-#include <locale_io.h>
 #include <macros.h>
 #include <pcb_calculator_datafile_lexer.h>
 #include <pcb_calculator_frame.h>
@@ -53,8 +54,6 @@ bool PANEL_REGULATOR::ReadDataFile()
     if( file == nullptr )
         return false;
 
-    // Switch the locale to standard C (needed to read/write floating point numbers)
-    LOCALE_IO toggle;
     m_RegulatorList.Clear();
 
     PCB_CALCULATOR_DATAFILE* datafile = new PCB_CALCULATOR_DATAFILE( &m_RegulatorList );
@@ -92,9 +91,6 @@ bool PANEL_REGULATOR::ReadDataFile()
 
 bool PANEL_REGULATOR::WriteDataFile()
 {
-    // Switch the locale to standard C (needed to read/write floating point numbers)
-    LOCALE_IO toggle;
-
     auto datafile = std::make_unique<PCB_CALCULATOR_DATAFILE>( &m_RegulatorList );
 
     try
@@ -155,19 +151,19 @@ void PCB_CALCULATOR_DATAFILE::Format( OUTPUTFORMATTER* aFormatter,
         aFormatter->Print( aNestLevel, "(%s %s\n", getTokenName( T_regulator ),
                            aFormatter->Quotew( item->m_Name ).c_str() );
 
-        aFormatter->Print( aNestLevel + 1, "(%s %g)\n", getTokenName( T_reg_vref_min ),
-                           item->m_VrefMin );
-        aFormatter->Print( aNestLevel + 1, "(%s %g)\n", getTokenName( T_reg_vref_typ ),
-                           item->m_VrefTyp );
-        aFormatter->Print( aNestLevel + 1, "(%s %g)\n", getTokenName( T_reg_vref_max ),
-                           item->m_VrefMax );
+        aFormatter->Print( aNestLevel + 1, "%s", fmt::format( "({} {:g})\n", getTokenName( T_reg_vref_min ),
+                           item->m_VrefMin ).c_str() );
+        aFormatter->Print( aNestLevel + 1, "%s", fmt::format( "({} {:g})\n", getTokenName( T_reg_vref_typ ),
+                           item->m_VrefTyp ).c_str() );
+        aFormatter->Print( aNestLevel + 1, "%s", fmt::format( "({} {:g})\n", getTokenName( T_reg_vref_max ),
+                           item->m_VrefMax ).c_str() );
 
         if( item->m_Type == 1 )
         {
-            aFormatter->Print( aNestLevel + 1, "(%s %g)\n", getTokenName( T_reg_iadj_typ ),
-                               item->m_IadjTyp );
-            aFormatter->Print( aNestLevel + 1, "(%s %g)\n", getTokenName( T_reg_iadj_max ),
-                               item->m_IadjMax );
+            aFormatter->Print( aNestLevel + 1, "%s", fmt::format( "({} {:g})\n", getTokenName( T_reg_iadj_typ ),
+                               item->m_IadjTyp ).c_str() );
+            aFormatter->Print( aNestLevel + 1, "%s", fmt::format( "({} {:g})\n", getTokenName( T_reg_iadj_max ),
+                               item->m_IadjMax ).c_str() );
         }
 
         aFormatter->Print( aNestLevel+1, "(%s %s)\n", getTokenName( T_reg_type ),
@@ -233,7 +229,10 @@ void PCB_CALCULATOR_DATAFILE_PARSER::ParseRegulatorDescr( PCB_CALCULATOR_DATAFIL
         if( token != T_NUMBER )
             Expecting( T_NUMBER );
 
-        sscanf( CurText(), "%lf", &val );
+        wxString text = CurText();
+        text.Trim( true ).Trim( false );
+
+        text.ToCDouble( &val );
         NeedRIGHT();
         return val;
     };
diff --git a/pcbnew/footprint_info_impl.cpp b/pcbnew/footprint_info_impl.cpp
index 2f585f36dd..4ddf81e6eb 100644
--- a/pcbnew/footprint_info_impl.cpp
+++ b/pcbnew/footprint_info_impl.cpp
@@ -27,7 +27,6 @@
 #include <footprint_info.h>
 #include <fp_lib_table.h>
 #include <kiway.h>
-#include <locale_io.h>
 #include <lib_id.h>
 #include <progress_reporter.h>
 #include <string_utils.h>
@@ -41,13 +40,13 @@
 #include <wx/wfstream.h>
 
 
-void FOOTPRINT_INFO_IMPL::load( const LOCALE_IO* aLocale )
+void FOOTPRINT_INFO_IMPL::load()
 {
     FP_LIB_TABLE* fptable = m_owner->GetTable();
 
     wxASSERT( fptable );
 
-    const FOOTPRINT* footprint = fptable->GetEnumeratedFootprint( m_nickname, m_fpname, aLocale );
+    const FOOTPRINT* footprint = fptable->GetEnumeratedFootprint( m_nickname, m_fpname );
 
     if( footprint == nullptr ) // Should happen only with malformed/broken libraries
     {
@@ -165,14 +164,7 @@ bool FOOTPRINT_LIST_IMPL::ReadFootprintFiles( FP_LIB_TABLE* aTable, const wxStri
 
 void FOOTPRINT_LIST_IMPL::loadFootprints()
 {
-    LOCALE_IO toggle_locale;
-
-    // Parse the footprints in parallel. WARNING! This requires changing the locale, which is
-    // GLOBAL. It is only thread safe to construct the LOCALE_IO before the threads are created,
-    // destroy it after they finish, and block the main (GUI) thread while they work. Any deviation
-    // from this will cause nasal demons.
-    //
-    // TODO: blast LOCALE_IO into the sun
+    // Parse the footprints in parallel.
 
     SYNC_QUEUE<std::unique_ptr<FOOTPRINT_INFO>> queue_parsed;
     thread_pool&                                tp = GetKiCadThreadPool();
@@ -180,7 +172,7 @@ void FOOTPRINT_LIST_IMPL::loadFootprints()
     std::vector<std::future<size_t>>            returns( num_elements );
 
     auto fp_thread =
-            [ this, &queue_parsed, &toggle_locale ]() -> size_t
+            [ this, &queue_parsed ]() -> size_t
             {
                 wxString nickname;
 
@@ -192,7 +184,7 @@ void FOOTPRINT_LIST_IMPL::loadFootprints()
                 CatchErrors(
                         [&]()
                         {
-                            m_lib_table->FootprintEnumerate( fpnames, nickname, false, &toggle_locale );
+                            m_lib_table->FootprintEnumerate( fpnames, nickname, false );
                         } );
 
                 for( wxString fpname : fpnames )
@@ -200,7 +192,7 @@ void FOOTPRINT_LIST_IMPL::loadFootprints()
                     CatchErrors(
                             [&]()
                             {
-                                auto* fpinfo = new FOOTPRINT_INFO_IMPL( this, nickname, fpname, &toggle_locale );
+                                auto* fpinfo = new FOOTPRINT_INFO_IMPL( this, nickname, fpname );
                                 queue_parsed.move_push( std::unique_ptr<FOOTPRINT_INFO>( fpinfo ) );
                             } );
 
diff --git a/pcbnew/footprint_info_impl.h b/pcbnew/footprint_info_impl.h
index fee0c569b6..1df5e1a73f 100644
--- a/pcbnew/footprint_info_impl.h
+++ b/pcbnew/footprint_info_impl.h
@@ -34,8 +34,7 @@ class LOCALE_IO;
 class FOOTPRINT_INFO_IMPL : public FOOTPRINT_INFO
 {
 public:
-    FOOTPRINT_INFO_IMPL( FOOTPRINT_LIST* aOwner, const wxString& aNickname, const wxString& aFootprintName,
-                         const LOCALE_IO* aLocale )
+    FOOTPRINT_INFO_IMPL( FOOTPRINT_LIST* aOwner, const wxString& aNickname, const wxString& aFootprintName )
     {
         m_nickname = aNickname;
         m_fpname = aFootprintName;
@@ -45,7 +44,7 @@ public:
 
         m_owner = aOwner;
         m_loaded = false;
-        load( aLocale );
+        load();
     }
 
     // A constructor for cached items
@@ -77,7 +76,7 @@ public:
     }
 
 protected:
-    virtual void load( const LOCALE_IO* aLocale ) override;
+    virtual void load() override;
 };
 
 
diff --git a/pcbnew/footprint_libraries_utils.cpp b/pcbnew/footprint_libraries_utils.cpp
index 30a750fb71..c0e8d17ae9 100644
--- a/pcbnew/footprint_libraries_utils.cpp
+++ b/pcbnew/footprint_libraries_utils.cpp
@@ -599,7 +599,7 @@ void PCB_EDIT_FRAME::ExportFootprintsToLibrary( bool aStoreInNewLib, const wxStr
         DisplayInfoMessage( this, _( "No footprints to export!" ) );
         return;
     }
-    
+
     auto resetReference =
             []( FOOTPRINT* aFootprint )
             {
@@ -1265,7 +1265,7 @@ FOOTPRINT* PCB_BASE_FRAME::CreateNewFootprint( wxString aFootprintName, const wx
         // Try to infer the footprint attributes from an existing footprint in the library
         try
         {
-            tbl->FootprintEnumerate( fpnames, aLibName, true, nullptr );
+            tbl->FootprintEnumerate( fpnames, aLibName, true );
 
             if( !fpnames.empty() )
                 footprintAttrs = tbl->FootprintLoad( aLibName, fpnames.Last() )->GetAttributes();
diff --git a/pcbnew/pcb_io/eagle/pcb_io_eagle.cpp b/pcbnew/pcb_io/eagle/pcb_io_eagle.cpp
index d7378f1c3d..17d45526f7 100644
--- a/pcbnew/pcb_io/eagle/pcb_io_eagle.cpp
+++ b/pcbnew/pcb_io/eagle/pcb_io_eagle.cpp
@@ -64,7 +64,6 @@ Load() TODO's
 #include <font/fontconfig.h>
 #include <geometry/geometry_utils.h>
 #include <string_utils.h>
-#include <locale_io.h>
 #include <trigo.h>
 #include <progress_reporter.h>
 #include <project.h>
@@ -324,7 +323,6 @@ VECTOR2I inline PCB_IO_EAGLE::kicad_fontsize( const ECOORD& d, int aTextThicknes
 BOARD* PCB_IO_EAGLE::LoadBoard( const wxString& aFileName, BOARD* aAppendToMe,
                                 const std::map<std::string, UTF8>* aProperties, PROJECT* aProject )
 {
-    LOCALE_IO       toggle;     // toggles on, then off, the C locale.
     wxXmlNode*      doc;
 
     fontconfig::FONTCONFIG::SetReporter( &WXLOG_REPORTER::GetInstance() );
@@ -3198,7 +3196,6 @@ void PCB_IO_EAGLE::cacheLib( const wxString& aLibPath )
         if( aLibPath != m_lib_path || m_timestamp != timestamp )
         {
             wxXmlNode*  doc;
-            LOCALE_IO   toggle;     // toggles on, then off, the C locale.
 
             deleteTemplates();
 
diff --git a/pcbnew/pcb_io/geda/pcb_io_geda.cpp b/pcbnew/pcb_io/geda/pcb_io_geda.cpp
index 56d20cbe79..31b7af70b1 100644
--- a/pcbnew/pcb_io/geda/pcb_io_geda.cpp
+++ b/pcbnew/pcb_io/geda/pcb_io_geda.cpp
@@ -35,7 +35,6 @@
 #include <font/fontconfig.h>
 #include <footprint.h>
 #include <pad.h>
-#include <locale_io.h>
 #include <macros.h>
 #include <pcb_text.h>
 #include <pcb_shape.h>
@@ -934,8 +933,6 @@ FOOTPRINT* PCB_IO_GEDA::FootprintLoad( const wxString& aLibraryPath,
 void PCB_IO_GEDA::FootprintDelete( const wxString& aLibraryPath, const wxString& aFootprintName,
                                    const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     init( aProperties );
 
     validateCache( aLibraryPath );
@@ -1036,8 +1033,6 @@ long long PCB_IO_GEDA::GetLibraryTimestamp( const wxString& aLibraryPath ) const
 
 bool PCB_IO_GEDA::IsLibraryWritable( const wxString& aLibraryPath )
 {
-    LOCALE_IO   toggle;
-
     init( nullptr );
 
     validateCache( aLibraryPath );
diff --git a/pcbnew/pcb_io/kicad_legacy/pcb_io_kicad_legacy.cpp b/pcbnew/pcb_io/kicad_legacy/pcb_io_kicad_legacy.cpp
index 3329ba9cd6..ed58091ada 100644
--- a/pcbnew/pcb_io/kicad_legacy/pcb_io_kicad_legacy.cpp
+++ b/pcbnew/pcb_io/kicad_legacy/pcb_io_kicad_legacy.cpp
@@ -71,7 +71,6 @@
 #include <boost/ptr_container/ptr_map.hpp>
 
 #include <string_utils.h>
-#include <locale_io.h>
 #include <macros.h>
 #include <filter_reader.h>
 #include <zones.h>
@@ -469,8 +468,6 @@ bool PCB_IO_KICAD_LEGACY::CanReadFootprint( const wxString& aFileName ) const
 BOARD* PCB_IO_KICAD_LEGACY::LoadBoard( const wxString& aFileName, BOARD* aAppendToMe,
                                  const std::map<std::string, UTF8>* aProperties, PROJECT* aProject )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     init( aProperties );
 
     std::unique_ptr<BOARD> boardDeleter;
@@ -3318,8 +3315,6 @@ bool PCB_IO_KICAD_LEGACY::DeleteLibrary( const wxString& aLibraryPath,
 
 bool PCB_IO_KICAD_LEGACY::IsLibraryWritable( const wxString& aLibraryPath )
 {
-    LOCALE_IO   toggle;
-
     init( nullptr );
 
     cacheLib( aLibraryPath );
diff --git a/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.cpp b/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.cpp
index e3dabf1df9..47043f95db 100644
--- a/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.cpp
+++ b/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.cpp
@@ -39,7 +39,6 @@
 #include <io/kicad/kicad_io_utils.h>
 #include <kiface_base.h>
 #include <layer_range.h>
-#include <locale_io.h>
 #include <macros.h>
 #include <pad.h>
 #include <pcb_dimension.h>
@@ -309,8 +308,6 @@ bool PCB_IO_KICAD_SEXPR::CanReadBoard( const wxString& aFileName ) const
 void PCB_IO_KICAD_SEXPR::SaveBoard( const wxString& aFileName, BOARD* aBoard,
                                     const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     wxString sanityResult = aBoard->GroupsSanityCheck();
 
     if( sanityResult != wxEmptyString && m_queryUserCallback )
@@ -379,8 +376,6 @@ BOARD_ITEM* PCB_IO_KICAD_SEXPR::Parse( const wxString& aClipboardSourceInput )
 
 void PCB_IO_KICAD_SEXPR::Format( const BOARD_ITEM* aItem ) const
 {
-    LOCALE_IO   toggle;     // public API function, perform anything convenient for caller
-
     switch( aItem->Type() )
     {
     case PCB_T:
@@ -3107,8 +3102,6 @@ void PCB_IO_KICAD_SEXPR::FootprintDelete( const wxString& aLibraryPath,
                                           const wxString& aFootprintName,
                                           const std::map<std::string, UTF8>* aProperties )
 {
-    LOCALE_IO   toggle;     // toggles on, then off, the C locale.
-
     init( aProperties );
 
     validateCache( aLibraryPath );
@@ -3139,8 +3132,6 @@ void PCB_IO_KICAD_SEXPR::CreateLibrary( const wxString& aLibraryPath,
                                           aLibraryPath.GetData() ) );
     }
 
-    LOCALE_IO   toggle;
-
     init( aProperties );
 
     delete m_cache;
@@ -3229,8 +3220,6 @@ bool PCB_IO_KICAD_SEXPR::DeleteLibrary( const wxString& aLibraryPath,
 
 bool PCB_IO_KICAD_SEXPR::IsLibraryWritable( const wxString& aLibraryPath )
 {
-    LOCALE_IO   toggle;
-
     init( nullptr );
 
     validateCache( aLibraryPath );
diff --git a/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr_parser.cpp b/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr_parser.cpp
index cbb2712137..ac9516396a 100644
--- a/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr_parser.cpp
+++ b/pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr_parser.cpp
@@ -61,7 +61,6 @@
 #include <pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.h>
 #include <pcb_plot_params_parser.h>
 #include <pcb_plot_params.h>
-#include <locale_io.h>
 #include <zones.h>
 #include <pcb_io/kicad_sexpr/pcb_io_kicad_sexpr_parser.h>
 #include <convert_basic_shapes_to_polygon.h>    // for RECT_CHAMFER_POSITIONS definition
@@ -809,8 +808,6 @@ FP_3DMODEL* PCB_IO_KICAD_SEXPR_PARSER::parse3DModel()
 
 bool PCB_IO_KICAD_SEXPR_PARSER::IsValidBoardHeader()
 {
-    LOCALE_IO       toggle;
-
     m_groupInfos.clear();
 
     // See Parse() - FOOTPRINTS can be prefixed with an initial block of single line comments,
@@ -831,7 +828,6 @@ BOARD_ITEM* PCB_IO_KICAD_SEXPR_PARSER::Parse()
 {
     T               token;
     BOARD_ITEM*     item;
-    LOCALE_IO       toggle;
 
     m_groupInfos.clear();
 
diff --git a/pcbnew/pcb_io/odbpp/odb_netlist.cpp b/pcbnew/pcb_io/odbpp/odb_netlist.cpp
index 970c643416..958e365907 100644
--- a/pcbnew/pcb_io/odbpp/odb_netlist.cpp
+++ b/pcbnew/pcb_io/odbpp/odb_netlist.cpp
@@ -27,7 +27,6 @@
 #include <build_version.h>
 #include <macros.h>
 #include <wildcards_and_files_ext.h>
-#include <locale_io.h>
 #include <board.h>
 #include <board_design_settings.h>
 #include <footprint.h>
diff --git a/pcbnew/pcb_io/pcad/pcb_io_pcad.cpp b/pcbnew/pcb_io/pcad/pcb_io_pcad.cpp
index 47c4edbdfb..6d77bb8e39 100644
--- a/pcbnew/pcb_io/pcad/pcb_io_pcad.cpp
+++ b/pcbnew/pcb_io/pcad/pcb_io_pcad.cpp
@@ -33,7 +33,6 @@
 #include <io/io_utils.h>
 
 #include <board.h>
-#include <locale_io.h>
 
 #include <cerrno>
 #include <wx/string.h>
@@ -77,8 +76,6 @@ BOARD* PCB_IO_PCAD::LoadBoard( const wxString& aFileName, BOARD* aAppendToMe,
 
     PCAD_PCB pcb( m_board );
 
-    LOCALE_IO toggle;    // toggles on, then off, the C locale.
-
     LoadInputFile( aFileName, &xmlDoc );
     pcb.ParseBoard( nullptr, &xmlDoc, wxT( "PCB" ) );
     pcb.AddToBoard();
diff --git a/pcbnew/pcb_io/pcb_io_mgr.cpp b/pcbnew/pcb_io/pcb_io_mgr.cpp
index 618e655f1b..54926c0569 100644
--- a/pcbnew/pcb_io/pcb_io_mgr.cpp
+++ b/pcbnew/pcb_io/pcb_io_mgr.cpp
@@ -28,7 +28,6 @@
 #include <config.h>
 #include <kiway_player.h>
 #include <wildcards_and_files_ext.h>
-#include <locale_io.h>
 #include <pcb_io/pcb_io_mgr.h>
 
 #include <pcb_io/eagle/pcb_io_eagle.h>
@@ -196,7 +195,6 @@ bool PCB_IO_MGR::ConvertLibrary( std::map<std::string, UTF8>* aOldFileProps, con
     if( oldFileType == PCB_IO_MGR::FILE_TYPE_NONE )
         return false;
 
-    LOCALE_IO           toggle_locale;
     IO_RELEASER<PCB_IO> oldFilePI( PCB_IO_MGR::PluginFind( oldFileType ) );
     IO_RELEASER<PCB_IO> kicadPI( PCB_IO_MGR::PluginFind( PCB_IO_MGR::KICAD_SEXP ) );
     wxArrayString fpNames;
diff --git a/pcbnew/python/scripting/pcbnew_scripting_helpers.cpp b/pcbnew/python/scripting/pcbnew_scripting_helpers.cpp
index 23de08acb7..2b5a0d4f94 100644
--- a/pcbnew/python/scripting/pcbnew_scripting_helpers.cpp
+++ b/pcbnew/python/scripting/pcbnew_scripting_helpers.cpp
@@ -56,7 +56,6 @@
 #include <specctra.h>
 #include <project/project_local_settings.h>
 #include <wildcards_and_files_ext.h>
-#include <locale_io.h>
 #include <wx/app.h>
 #include <wx/crt.h>
 #include <wx/image.h>
@@ -127,10 +126,6 @@ SETTINGS_MANAGER* GetSettingsManager()
 
 PROJECT* GetDefaultProject()
 {
-    // For some reasons, LoadProject() needs a C locale, so ensure we have the right locale
-    // This is mainly when running QA Python tests
-    LOCALE_IO dummy;
-
     PROJECT* project = GetSettingsManager()->GetProject( "" );
 
     if( !project )
@@ -160,11 +155,6 @@ BOARD* LoadBoard( const wxString& aFileName, PCB_IO_MGR::PCB_FILE_T aFormat, boo
     // By default only the BMP handler is available.
     wxInitAllImageHandlers();
 
-
-    // Ensure the "C" locale is temporary set, before reading any file
-    // It also avoid wxWidget alerts about locale issues, later, when using Python 3
-    LOCALE_IO dummy;
-
     PROJECT* project = GetSettingsManager()->GetProject( projectPath );
 
     if( !project )
@@ -281,10 +271,6 @@ BOARD* NewBoard( wxString& aFileName )
 
     wxString projectPath = proFn.GetFullPath();
 
-    // Ensure the "C" locale is temporary set, before reading any file
-    // It also avoids wxWidgets alerts about locale issues, later, when using Python 3
-    LOCALE_IO dummy;
-
     GetSettingsManager()->LoadProject( projectPath, false );
     PROJECT* project = GetSettingsManager()->GetProject( projectPath );
 
@@ -319,10 +305,6 @@ bool SaveBoard( wxString& aFileName, BOARD* aBoard, PCB_IO_MGR::PCB_FILE_T aForm
     aBoard->BuildConnectivity();
     aBoard->SynchronizeNetsAndNetClasses( false );
 
-    // Ensure the "C" locale is temporary set, before saving any file
-    // It also avoid wxWidget alerts about locale issues, later, when using Python 3
-    LOCALE_IO dummy;
-
     try
     {
         PCB_IO_MGR::Save( aFormat, aFileName, aBoard, nullptr );