As reported by Jens Grunert on the mailing list
> > 
> > Sometimes i had problems to upload picture to picasaweb. The following exception was thrown:
> > 
> > System.NotImplementedException: No way to save files of type ".jpg"
> >   at FSpot.Filters.ResizeFilter.Convert (System.String source, System.String dest) [0x00000] 
> >   at FSpot.Filters.FilterSet.Convert (System.String source, System.String dest) [0x00000] 
> >   at FSpot.GoogleExport.Upload () [0x00000] 
> > 
> > 
> > So what's the problem? The problem are files with the extension .JPG (btw.: .jpg works).
> > I think the problem is the Method:
> > 
> > public static string TempPath (string name, string extension){}
> > 
> > The Method handles only .jpg files! Btw: Why is the extension hardcoded?
> > When you use the Method System.IO.Path.GetExtension() to get the extension everything works fine.