Firstly you get the map unprotetor program [ Link ]
Youm can unprotect maps with the RoC unprotector, all ou need to do is change the file type you are looking for when you press browse [ make it look for all file types ]
If you get an error when opening or unprotecting the map [ something about a DLL file ] all you need to do is DL the file from
http://www.piankanetwork.com/shadowfrench/ocx/
or
http://www.dll-files.com/dllindex/index.shtml
put the files in the same directory as your unprotector .exe file
after you do this it should work.
Remember that not all the triggers will be restored to original state....
If i have left anything out please post and let me know.....
Use the link posted by ziutek for download of the unprotector