METAL GEAR SOLID: MASTER COLLECTION Vol.1 METAL GEAR SOLID Cheats and Trainer for Steam

Everything. Attempting to use anything just crashes my game to the desktop, no error or reason given at all.

Got it. Just to confirm, are you only trying to use the mods on Metal Gear Solid 1?

Correct.

Hmm strange since our testers confirmed it works fine as long as the game is on english version. try to Verify integrity Files by right-clicking on the game and click Properties. Click on the Local Files tab. Click on Verify Integrity of Game Files. Then force quit/close the WeMod App then re-launch the apps.

Sorry for the delay in replying.
Just tried, still having the same issue. Verified integrity, nothing wrong. Booted up the game and WeMod, enabled all 4 codes, still nothing worked.