I am obviously a newbie, especially when it comes to mods, and what to do with them. I have GSC Extreme 13, AC(steam) and RaceRoom(steam)and I was hoping someone can explain the process, for both Steam, and non-Steam sims . I poked around in the "Program Files", but didn't see anything "obvious". Are there any issues I need to be concerned about "trusting" these downloads, from both, a security standpoint, and a "bug-causing" one? Any help would be greatly appreciated.