If you have two mods that modify the same file and you want to use them both, this is easy solution for you.
If you can't start the program, you probably don't have Java Runtime Environment installed, you can get it from here: http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html
Please report any bugs or improvement ideas.
If it doesn't work, post the exact error message you get
Forum thread: http://www.justcause2mods.com/forum/14-modifications/22333-mod-combiner
Check out my other tools:
- Fixed bug which caused program to think it's located in system32