.zip or .rar file and select "Extract Here" or "Extract to [Folder]"..pack (e.g., mk1212_main.pack, mk1212_campaign.pack)..pack files into the data folder you opened in Step 2.
Navigate to: C:\Users\[YourName]\AppData\Roaming\The Creative Assembly\Attila\scripts . Open preferences.script.txt with Notepad.