Is there some way finnwars sp (or Original) can be changed to allow all maps to work oh and can you please give me a link to reinstall finnwars sp since I dont know if that will help . I say this because finnwars sp has crashed some times in villpuri , etc . and can copying the music and movies folder affect this ( since I did this to add both to the game)

Now I'm a bit confused what did you ask but..

I'm afraid that we can't provide much help for Single-player as it is not made by the original FinnWars team. It is a 'quite' non-stable, fan-made expansion to the original mod.

There's only a pair of maps that'll work in SP most of the time, and that's it.

For my knowledge, Single-player needs the full FW installed.
And here's the link to installer.

Concerning the poking around the mod files and folders, I can't say anything.
It may or it may not affect how FW itself or single-player works.