You're here because you have a file that has a file extension ending in .vdf. Files with the file extension .vdf can only be launched by certain applications. It's possible that .vdf files are data files rather than documents or media, which means they're not meant to be viewed at all.

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.

Launch a .vdf file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .vdf file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .vdf files aren't yet associated with it. In this case, when you try to open a .vdf file, you can tell Windows which application is the correct one for that file. From then on, opening a  .vdf file will open the correct application. Click here to fix .vdf file association errors

Be careful not to rename the extension on .vdf files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .vdf. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.