To apply mods you'll need to extract the physics.rbz file
Do that by renaming it to physics.zip - then unzip to a folder
(back-up a your original physics.rbz before you do this)
The result is a folder 'Physics' which you put in place of the physics.rbz file
Dont leave the original file physics.rbz in the root RichardBunrnsRally directory.
A lot of mods are just a case of overwriting the files inside this 'Physics' folder
Replays go into the Replays folder thats all
And a nice, quick cheat, if you're having trouble in RallySchool, is to simply increase the value of....