diff --git a/src/common/fontcmn.cpp b/src/common/fontcmn.cpp
index cef604180a..b088f2adb3 100644
--- a/src/common/fontcmn.cpp
+++ b/src/common/fontcmn.cpp
@@ -747,6 +747,7 @@ void wxNativeFontInfo::SetPointSize(int pointsize)
 bool wxNativeFontInfo::FromString(const wxString& s)
 {
     long l;
+    double d;
     unsigned long version;
 
     wxStringTokenizer tokenizer(s, wxT(";"));
@@ -756,9 +757,11 @@ bool wxNativeFontInfo::FromString(const wxString& s)
         return false;
 
     token = tokenizer.GetNextToken();
-    if ( !token.ToLong(&l) )
+    if ( !token.ToCDouble(&d) )
+        return false;
+    pointSize = static_cast<float>(d);
+    if ( static_cast<double>(pointSize) != d )
         return false;
-    pointSize = (int)l;
 
     token = tokenizer.GetNextToken();
     if ( !token.ToLong(&l) )
@@ -773,7 +776,9 @@ bool wxNativeFontInfo::FromString(const wxString& s)
     token = tokenizer.GetNextToken();
     if ( !token.ToLong(&l) )
         return false;
-    weight = (wxFontWeight)l;
+    weight = ConvertFromLegacyWeightIfNecessary(l);
+    if ( weight <= wxFONTWEIGHT_INVALID || weight > wxFONTWEIGHT_MAX )
+        return false;
 
     token = tokenizer.GetNextToken();
     if ( !token.ToLong(&l) )
@@ -807,12 +812,12 @@ wxString wxNativeFontInfo::ToString() const
 {
     wxString s;
 
-    s.Printf(wxT("%d;%d;%d;%d;%d;%d;%d;%s;%d"),
+    s.Printf(wxT("%d;%f;%d;%d;%d;%d;%d;%s;%d"),
              1,                                 // version
-             GetPointSize(),
+             GetFractionalPointSize(),
              family,
              (int)style,
-             (int)weight,
+             weight,
              underlined,
              strikethrough,
              faceName.GetData(),
diff --git a/src/msw/font.cpp b/src/msw/font.cpp
index 5f7f34c6c6..76a2cc3c35 100644
--- a/src/msw/font.cpp
+++ b/src/msw/font.cpp
@@ -635,9 +635,32 @@ bool wxNativeFontInfo::FromString(const wxString& s)
 
     // first the version
     wxString token = tokenizer.GetNextToken();
-    if ( token != wxS('0') )
+    if ( !token.ToLong(&l) )
         return false;
 
+    switch ( l )
+    {
+        case 0:
+            // Fractional point size is not present in this version.
+            pointSize = 0.0f;
+            break;
+
+        case 1:
+            {
+                double d;
+                if ( !tokenizer.GetNextToken().ToCDouble(&d) )
+                    return false;
+                pointSize = static_cast<float>(d);
+                if ( static_cast<double>(pointSize) != d )
+                    return false;
+            }
+            break;
+
+        default:
+            // Unknown version.
+            return false;
+    }
+
     token = tokenizer.GetNextToken();
     if ( !token.ToLong(&l) )
         return false;
@@ -716,8 +739,9 @@ wxString wxNativeFontInfo::ToString() const
 {
     wxString s;
 
-    s.Printf(wxS("%d;%ld;%ld;%ld;%ld;%ld;%d;%d;%d;%d;%d;%d;%d;%d;%s"),
-             0, // version, in case we want to change the format later
+    s.Printf(wxS("%d;%f;%ld;%ld;%ld;%ld;%ld;%d;%d;%d;%d;%d;%d;%d;%d;%s"),
+             1, // version
+             pointSize,
              lf.lfHeight,
              lf.lfWidth,
              lf.lfEscapement,
diff --git a/src/osx/carbon/font.cpp b/src/osx/carbon/font.cpp
index 7de7178551..8dc154e8a5 100644
--- a/src/osx/carbon/font.cpp
+++ b/src/osx/carbon/font.cpp
@@ -889,6 +889,7 @@ CGFloat wxNativeFontInfo::GetCTSlant(CTFontDescriptorRef descr)
 //
 bool wxNativeFontInfo::FromString(const wxString& s)
 {
+    double d;
     long l, version;
 
     Init();
@@ -904,9 +905,16 @@ bool wxNativeFontInfo::FromString(const wxString& s)
     //
 
     token = tokenizer.GetNextToken();
-    if ( !token.ToLong(&l) )
+    if ( !token.ToCDouble(&d) )
         return false;
-    m_ctSize = (int)l;
+#ifdef __LP64__
+    // CGFloat is just double in this case.
+    m_ctSize = d;
+#else // !__LP64__
+    m_ctSize = static_cast<CGFloat>(d);
+    if ( static_cast<double>(m_ctSize) != d )
+        return false;
+#endif // __LP64__/!__LP64__
 
     token = tokenizer.GetNextToken();
     if ( !token.ToLong(&l) )
@@ -959,12 +967,12 @@ wxString wxNativeFontInfo::ToString() const
 {
     wxString s;
 
-    s.Printf(wxT("%d;%d;%d;%d;%d;%d;%d;%s;%d"),
+    s.Printf(wxT("%d;%f;%d;%d;%d;%d;%d;%s;%d"),
         1, // version
-        GetPointSize(),
+        GetFractionalPointSize(),
         GetFamily(),
         (int)GetStyle(),
-        (int)GetWeight(),
+        GetNumericWeight(),
         GetUnderlined(),
         GetStrikethrough(),
         GetFaceName().GetData(),