Enrico,
In function FW_ReadImage() at FWH\source\function\imgtxtio.prg please modify this:
elseif ( UseGDI() .or. lGdipImage ) .and. cExt $ "PNG,JPG,JPEG,GIF,TIF,TIFF,EMF,WMF"
with
elseif ( UseGDI() .or. lGdipImage ) .and. cExt $ "PNG,JPG,JPEG,GIF,TIF,TIFF,EMF,WMF,PAK"