You're on steam or not ?
Normaly they are a read me with MOD (Because files to add depends on the mods).
With steam most mods add files in \"Steam \ SteamApps \ *Your login steam* \ race 07 \\" GameData and UIData.
They will work for any of the games... it doesn't matter which one you have, the latest Steam patches allowed the games to be inter-compatible.
Think you've downloaded a carskin And then you need to have the Corvette in your game by buying GTR Evolution expansion. A few bucks and its yours
Look through your car select menu and you will see the cars you have on offer.
Actual modifications such Porche Mobil 1 Supercup should work with RACE as they are standalone mods. Skins are simply new liveries for existing cars in the game.
Should just add new cars. The ReadMe for each mod will let you know any details.
There aren't that many and you'll learn more by figuring that out for yourself. Our download section is a good place to start.
Thanks! Game worked for a good 6 years!
And the last post was 12 years ago before you posted! It's cool how you came back to say a thank you, though the person you are replying to hasn't been seen here since 2012. Also, I agree with @Kenny Paton , @AndreasFSC is the one to go to for RACE 07 mods!