Notes about the VTF file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The VTF file type is primarily associated with 'Steam' by Valve Corporation. The Source engine technology, the same used to power Half-Life 2 is available to Steam subscribers. It provides enhancements in several key areas including character animation, advanced AI, real-world physics, and shader-based rendering to allow you to create game MODs. This is a file compiled from a .VMT file.