VDF File

What are VDF files and how to open them

Are you having problems opening a VDF file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your VDF files.

What is a VDF file?

VDF files have multiple uses, and VirtualDub Filter Plug-in is one of them. Read more about the other uses further down the page.

VirtualDub Filter Plug-in

VDF is an acronym for VirtualDub Filter. Files that contain the .vdf file extension usually hold filter plug-ins for the VirtualDub video capture and processing software application.

The VDF plug-ins contained in these files allow for special effects and added file support within the VirtualDub application.

How to open VDF files

We have identified one VDF opener that is compatible with this specific type of VDF file.

Programs that open VirtualDub Filter Plug-in files

Last updated: August 14, 2026

All known file formats using extension .VDF

While VirtualDub Filter Plug-in is a popular type of VDF-file, we know of 3 different uses of the .VDF file extension. Different software may use files with the same extension for different types of data.

Avira AntiVir Virus Database

The .vdf file extension is also used for AntiVir virus definition files. These files store information about the viruses that the AntiVir program scans a user's hard drive for.

VDF opener for Windows

We have identified one VDF opener that is compatible with this specific type of VDF file.

Steam Install Script

Steam Install Script (.VDF) is a configuration file used by Steam to automate setup tasks needed before a game works correctly.

These files are created by game developers using the Steamworks SDK as part of a build and uploaded with the game's install depots. They contain instructions Steam runs automatically during installation or first launch. Common tasks defined in these scripts include creating registry entries under keys like HKEY_LOCAL_MACHINE, installing redistributable software such as DirectX or Visual C++ runtimes, or running setup executables.

When Steam installs a game or its DLC, it checks whether any install script is flagged in the depot manifest. If so, it downloads the script, validates its cryptographic signature, then executes the actions described. It can also include OS-version checks, silent execution flags, cleanup behavior, and actions for uninstall. These rules ensure necessary prerequisites are set up without user intervention.

Technically the file is in Valve's KeyValues format under a section named InstallScript. It uses quoted strings to pair keys and values and nested blocks to represent actions like "Registry" or "Run Process." The file often includes fields such as HasRunKey, Command, NoCleanUp, and language-specific subkeys. The presence of registry paths like HKEY_LOCAL_MACHINE is a strong internal identifier.

Programs that open these VDF files

We have identified one VDF opener that is compatible with this specific type of VDF file.

Various apps that use files with this extension

These apps are known to open certain types of VDF files. Remember, different programs may use VDF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about VDF file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.