Saving Metafiles

Question

I have a problem with saving metafiles. I open *.wmf file into Image and then do Image.Save(filename, ImageFormat.Wmf) but it seems that the saved file is always bmp file. I also tried to use ImageCodecInfo encoder, but when I get the encoders, there isn't one for metafiles (only tif, jpg, gif, bmp and png) Am I missing something, or .net doesn't support saving back metafiles? Thanks.