Microsoft WMF format. Image file format. Used by the Windows operating system and by Microsoft applications as a graphics resource format. WMF is an acronym derived from Windows Metafile. Binary format. Stores vector graphics, raster graphics, and text. Stores image data as either calls to the Windows graphical device interface (GDI), uncompressed Device Dependent Bitmaps, or uncompressed Device Independent Bitmaps. Predecessor of the 32-bit EMF format. Developed by Microsoft as part of Windows 95.