fix for temp file creation under Windows

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13124 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filename.cpp

@@ -628,7 +628,16 @@ wxFileName::CreateTempFileName(const wxString& prefix, wxFile *fileTemp)
     {
         // open the file - of course, there is a race condition here, this is
         // why we always prefer using mkstemp()...
-        if ( !fileTemp->Open(path, wxFile::write_excl, wxS_IRUSR | wxS_IWUSR) )
+        //
+        // NB: GetTempFileName() under Windows creates the file, so using
+        //     write_excl there would fail
+        if ( !fileTemp->Open(path,
+#if defined(__WINDOWS__) && !defined(__WXMICROWIN__)
+                             wxFile::write,
+#else
+                             wxFile::write_excl,
+#endif
+                             wxS_IRUSR | wxS_IWUSR) )
         {
             // FIXME: If !ok here should we loop and try again with another
             //        file name?  That is the standard recourse if open(O_EXCL)