Notes about the CHEAT file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The CHEAT file type is primarily associated with 'The Sims' by Electronic Arts, Inc.. The USERSTARTUP.CHEAT file is where you can put custom settings that you want turned on each time you start the game. You can also create "aliases" (shortened commands) to run cheat commands. Anything which is in your userstartup.cheat file will be activated when you run the game. The file is usually found in My Documents\EA Games\The Sims 2\Config.