VTFEdit is a software tool used to open VTF (Valve Texture Format) files as well as to save tga and other picture files into VTF.

Issues

Error: File version 7.5 does not match 7.0 to 7.4

This a common problem that occurs when a VTF file is updated to the latest version. The solution is to trick VTFEdit into thinking the VTF file is a version in the range of 7.0 to 7.4.

Solution

Download HxD or a similar hex editor program
Install HxD
Open the VTF File
In the 00000000 row, under the 08 column it should say 05
Simply change 05 to 04 and save