Create a shortcut from the base BTS exe...rename it to BAT or whatever. Go to that shortcut's properties and add the following at the end of the "Target" field: mod=" BAT Mod 4.1" (make sure there is a space between that text and the other text) here's a pic that might help: Spoiler : Use that shortcut whenever you want to run BAT. I have several of them for the mods I run. Basically, for any mod you have installed, you can create this shortcut, and the mod name just needs to match the name of that mod's folder...in the Mod folder. edit: I just realized that you might see a space right between the quote and BAT in my pic. For some reason I had to do that for it to work with my Steam install..no clue why, but I fixed it like that based on the error message it was giving me. You likely will not have to do that all. I've been using these shortcuts for years on non-Steam versions without having to monkey with anything. Note: There is a way to have a single mod run always by changing the Config file, but I don't like that way since I run different stuff all the time.