diff --git a/include/wx/msw/stdpaths.h b/include/wx/msw/stdpaths.h
index e9e1e8b231..23564fc9cb 100644
--- a/include/wx/msw/stdpaths.h
+++ b/include/wx/msw/stdpaths.h
@@ -29,6 +29,7 @@ public:
     virtual wxString GetUserLocalDataDir() const wxOVERRIDE;
     virtual wxString GetPluginsDir() const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
+    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
 
 
     // MSW-specific methods
diff --git a/include/wx/osx/cocoa/stdpaths.h b/include/wx/osx/cocoa/stdpaths.h
index 59c33f2019..d361d5f65d 100644
--- a/include/wx/osx/cocoa/stdpaths.h
+++ b/include/wx/osx/cocoa/stdpaths.h
@@ -32,6 +32,7 @@ public:
     GetLocalizedResourcesDir(const wxString& lang,
                              ResourceCat category = ResourceCat_None) const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
+    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating
diff --git a/include/wx/stdpaths.h b/include/wx/stdpaths.h
index 8f7c2d43bb..382a99dfd6 100644
--- a/include/wx/stdpaths.h
+++ b/include/wx/stdpaths.h
@@ -155,6 +155,8 @@ public:
 
     virtual wxString GetUserDir(Dir userDir) const;
 
+    virtual wxString MakeConfigFileName(const wxString& basename, int style) const = 0;
+
     // virtual dtor for the base class
     virtual ~wxStandardPathsBase();
 
diff --git a/include/wx/unix/stdpaths.h b/include/wx/unix/stdpaths.h
index 74f915398c..d0ec1469e5 100644
--- a/include/wx/unix/stdpaths.h
+++ b/include/wx/unix/stdpaths.h
@@ -49,6 +49,7 @@ public:
 #ifndef __VMS
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
 #endif
+    virtual wxString MakeConfigFileName(const wxString& basename, int style) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating
diff --git a/interface/wx/stdpaths.h b/interface/wx/stdpaths.h
index 9a1f3cbf9f..6484c94cf1 100644
--- a/interface/wx/stdpaths.h
+++ b/interface/wx/stdpaths.h
@@ -444,6 +444,18 @@ public:
     */
     void UseAppInfo(int info);
 
+    /**
+        Return the file name which would be used by wxFileConfig as local,
+        user-specific, file if it were constructed with @a basename.
+
+        @a style has the same meaning as in @ref wxConfigBase::wxConfigBase "wxConfig constructor"
+        and can contain any combination of styles but only wxCONFIG_USE_SUBDIR bit is
+        examined by this function.
+
+        Notice that this function cannot be used if @a basename is already a full path name.
+    */
+    virtual wxString MakeConfigFileName(const wxString& basename, int style) const;
+
 protected:
     /**
         Protected default constructor.
diff --git a/src/common/fileconf.cpp b/src/common/fileconf.cpp
index c87bcf82f0..6de548379d 100644
--- a/src/common/fileconf.cpp
+++ b/src/common/fileconf.cpp
@@ -247,26 +247,6 @@ public:
 // static functions
 // ----------------------------------------------------------------------------
 
-// this function modifies in place the given wxFileName object if it doesn't
-// already have an extension
-//
-// note that it's slightly misnamed under Mac as there it doesn't add an
-// extension but modifies the file name instead, so you shouldn't suppose that
-// fn.HasExt() is true after it returns
-static void AddConfFileExtIfNeeded(wxFileName& fn)
-{
-    if ( !fn.HasExt() )
-    {
-#if defined( __WXMAC__ )
-        fn.SetName(fn.GetName() + wxT(" Preferences"));
-#elif defined( __UNIX__ )
-        fn.SetExt(wxT("conf"));
-#else   // Windows
-        fn.SetExt(wxT("ini"));
-#endif  // UNIX/Win
-    }
-}
-
 wxString wxFileConfig::GetGlobalDir()
 {
     return wxStandardPaths::Get().GetConfigDir();
@@ -286,30 +266,13 @@ wxString wxFileConfig::GetLocalDir(int style)
 
 wxFileName wxFileConfig::GetGlobalFile(const wxString& szFile)
 {
-    wxFileName fn(GetGlobalDir(), szFile);
-
-    AddConfFileExtIfNeeded(fn);
-
+    wxFileName fn(GetGlobalDir(), wxStandardPaths::Get().MakeConfigFileName(szFile, wxCONFIG_USE_SUBDIR));
     return fn;
 }
 
 wxFileName wxFileConfig::GetLocalFile(const wxString& szFile, int style)
 {
-    wxFileName fn(GetLocalDir(style), szFile);
-
-#if defined( __UNIX__ ) && !defined( __WXMAC__ )
-    if ( !(style & wxCONFIG_USE_SUBDIR) )
-    {
-        // dot-files under Unix start with, well, a dot (but OTOH they usually
-        // don't have any specific extension)
-        fn.SetName(wxT('.') + fn.GetName());
-    }
-    else // we do append ".conf" extension to config files in subdirectories
-#endif // defined( __UNIX__ ) && !defined( __WXMAC__ )
-    {
-        AddConfFileExtIfNeeded(fn);
-    }
-
+    wxFileName fn(GetLocalDir(style), wxStandardPaths::Get().MakeConfigFileName(szFile, style));
     return fn;
 }
 
diff --git a/src/msw/stdpaths.cpp b/src/msw/stdpaths.cpp
index 29aa6b9192..081ab600a7 100644
--- a/src/msw/stdpaths.cpp
+++ b/src/msw/stdpaths.cpp
@@ -369,6 +369,14 @@ wxString wxStandardPaths::GetPluginsDir() const
     return GetAppDir();
 }
 
+
+wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int WXUNUSED(style)) const
+{
+    wxFileName fn(wxEmptyString, basename);
+    fn.SetExt(wxT("ini"));
+    return fn.GetFullName();
+}
+
 // ============================================================================
 // wxStandardPathsWin16 implementation
 // ============================================================================
diff --git a/src/osx/cocoa/stdpaths.mm b/src/osx/cocoa/stdpaths.mm
index a8b8323d2a..cd9b75b46a 100644
--- a/src/osx/cocoa/stdpaths.mm
+++ b/src/osx/cocoa/stdpaths.mm
@@ -19,6 +19,7 @@
 
 #if wxUSE_STDPATHS
 
+#include "wx/filename.h"
 #include "wx/stdpaths.h"
 #include "wx/osx/private.h"
 #include "wx/osx/core/cfstring.h"
@@ -129,4 +130,11 @@ wxString wxStandardPaths::GetUserDir(Dir userDir) const
     return GetFMDirectory(dirType, NSUserDomainMask);
 }
 
+wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int WXUNUSED(style)) const
+{
+    wxFileName fn(wxEmptyString, basename);
+    fn.SetName(fn.GetName() + wxT(" Preferences"));
+    return fn.GetFullName();
+}
+
 #endif // wxUSE_STDPATHS
diff --git a/src/unix/stdpaths.cpp b/src/unix/stdpaths.cpp
index 5f61f19ecb..fecde0c634 100644
--- a/src/unix/stdpaths.cpp
+++ b/src/unix/stdpaths.cpp
@@ -33,6 +33,7 @@
     #include "wx/utils.h"
 #endif //WX_PRECOMP
 
+#include "wx/fileconf.h"
 #include "wx/filename.h"
 #include "wx/log.h"
 #include "wx/textfile.h"
@@ -308,4 +309,14 @@ wxString wxStandardPaths::GetUserDir(Dir userDir) const
 
 #endif // __VMS/!__VMS
 
+wxString wxStandardPaths::MakeConfigFileName(const wxString& basename, int style) const
+{
+    wxFileName fn(wxEmptyString, basename);
+    if (style & wxCONFIG_USE_SUBDIR)
+        fn.SetExt(wxT("conf"));
+    else
+        fn.SetName(wxT('.') + fn.GetName());
+    return fn.GetFullName();
+}
+
 #endif // wxUSE_STDPATHS