Editing or replacing .qvm files is the primary way to enable "God Mode," unlimited health, or infinite ammo by modifying values within the file using a QVM Editor on GitHub or hex editor. How to Install a New Config.qvm File
If you prefer not to download a file from the internet, you can edit your own. Since .qvm files are encoded, it is often easier to use a "Config Editor" tool specifically made for IGI 2, or use a Hex Editor to find the following hex values: Igi 2 Config.qvm File Download