I recently logged into a Mod server for the first time in an FPS and as a result I lost all my custom created character classes (unintended alliteration). Tech support told me to save my profile data, then reinstall the game to completely wipe out the Mod map data, but I'd still have to rebuild my custom built classes. Generally speaking, is joining Mod servers a risky activity? Or was my experience an anamoly? Below as an excerpt from an email to me by tech support regarding Mods: "Mods (maps, weapons, etc) are not supported for Call of Duty 4. The issue with these are that they are mostly user created and can contain a variety of errors when loaded on various machines. Unfortunately, there is no way to completely recover your custom classes. Once a mod is loaded, the code from them (again, being user created and not supported by Aspyr or Activision) can cause problems with the base game. The only way to ensure that the mod content is completely removed, you will need to reinstall the game." Thank you.