A VDF is a data file used by AntiVir, an antivirus application for Windows. VDF saves virus definitions, which contain signatures that are used for recognizing viruses on the computer system. It is often downloaded during software updates so the software can check for new viruses. VDF files are saved to the AntiVir installation directory.

A VirtualDub video filter file is deployed by VirtualDub to extend the functionalities implemented into the VirtualDub software. Classified as a plug-in file, the content of a VirtualDub video filter file may include additional video effects and file support features that can be added to the VirtualDub program. The VirtualDub software is an application that is integrated with a set of functionalities used for recording or capturing videos and rendering or processing these captured videos to add effects, captions and other video-related metadata details. A VirtualDub video filter file is implemented with source code compilation specifications proprietary to VirtualDub, and these specifications allow the content of a VirtualDub video filter file to be stored in the VDF file format, the standard format used by the VirtualDub software for its supported plug-ins. Appended with the .vdf extension, a VirtualDub video filter file can be loaded unto the VirtualDub software by going to the dialogue box of the VirtualDub program labeled "Add Filters", then clicking "Load". Before doing so, the user should store these VirtualDub video filter files in a directory labeled "plugins" within the VirtualDub installation folder.

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