Driver file used by the Windows Kernel-Mode Driver Framework (KMDF) and User-Mode Driver Framework (UMDF) components; typically contains an empty file that serves as a driver version marker; used by Microsoft's Online Crash Analysis (OCA) tool to provide driver information.

WDF files are typically found in the %windir%\system32\drivers directory. Examples of WDF files include MsftWdf_user_01_09_00.Wdf, MsftWdf_Kernel_01009_Coinstaller_Critical.Wdf, and Msft_Kernel_WdfRamdisk_01009.Wdf. The Windows Driver Foundation (WDF) is a conceptual driver model that includes the KMDF and UMDF Windows components, as well as driver verification tools.

Family tree file created by WinGenea, a program used to store and print genealogies; stores up to 32,000 individuals and how they relate to each other; may contain names, dates, locations, and sources; used to store family ancestry information.

A WDF file is a data file saved in a format developed by Wintech Engineering and used for computer-aided manufacturing (CAD). It contains one or more objects and shapes saved in the order that they are to be cut. WDF files are used by computer numerically controlled (CNC) machinery used to cut designs out of different materials.

WDF files can be opened by versions 5 to 9 of Wintech Profiler. The WDF file type is used by Profiler 5 (macOS), Profiler 6 (Windows), Profiler 7 (Windows), Profiler 8 (Windows) and the Profiler 9.

Media file used by Wonderland Adventures, a game developed by Midnight Synergy; usually a renamed graphic or audio file.

WDF files may contain sound effects for the game or images used for graphics, textures, and model skins. They can be renamed and opened as a different image file type (such as a .BMP file). NOTE: WDF files can be opened in Windows Media Player and Windows Photo Viewer. However, you may need to change the file extension in order for Windows Photo Viewer to open the file.

Document created by Workshare Compare, an application used for document comparison; stores a document that contains the comparison, or redline, between two versions of a document; used for document collaboration in office environments.