The vtfedit12520.exe file you have requested: miscellaneous / VTFEdit 1.25 Graphics Tool - 849.54kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
VTFEdit is a VTF texture conversion utility with a graphical interface. It can convert to and from and view all versions of the Valve Texture Format, and change the files' settings without requiring them to be recompiled.