The WMF format is used to store Vector Formats and Bitmap data. Because of its popularity many Windows and non-Windows applications support WMF.
When reading a WMF file, some applications convert all of the image data to a raster image. When writing a WMF file, some imaging applications save all of the image data as a raster image within the WMF file. Therefore, if you load and save a WMF file, you convert any vectored image data that the original contained.
