Ok so I was trying to take some configs from a mod and put them into another so i don't have to have all the cars from the other mod... but every time I unzip the mod and zip it back up, it doesn't work anymore. I have tested it without making any changes to the folder and same result.
BeamNG only handles specific sorts of zip. If you've got an archive utility installed like 7-Zip, WinRAR, WinZIP, etc, it's possible to create many types of archive which they game can't use. Files such as .7z and .RAR definitely will not work. Even zip archives with certain types of compression will not work. The built-in ZIP functionality in Win7 works fine, but here are some settings which will work in an archiving program such as 7-Zip:
