Using Aspose.Imaging for .NET library it is easy To convert To WMF(Microsoft Windows Metafile) from other supported image formats...to WMF BMP to WMF DIB to WMF DICOM to WMF DJVU to WMF DNG to WMF...to WMF J2K to WMF JPG to WMF JPEG to WMF PNG to WMF TGA to WMF...