Well yes, and this engine dependent. iD-Tech engine 4 compresses uts data in .pak files which can easily be extracted by opening it with WinRAR or relevant software. And you just need to do the rest (Editing the file).
We were calmly discussing about the id-Tech 4 engine. The flaming part is almost non-existent here.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem