Could you give me a little more information?

ok..
When i enter the finalsun it says "Tiberian Sun is not correctly installed (TibSun.mix could not be loaded)"
like tht...
any idea how to fix it?

I take it those other mods you're talking about come with their very own modified Final Sun, just like DTA does?
Well, in that case you have 2 options:

1. The first option is to make sure the mod you're trying to use Final Sun with is installed in the default Tiberian Sun directory (this mean the directory you installed Tiberian Sun in from its installation disc).
2. The second option is to delete FinalSun.ini (located in the modified Final Sun's directory) before you start Final Sun and you will have to do this every time you start Final Sun.

oh thx...
now i can enter the final sun...
but....
after i finished the map then i try to test the map...
y it crash when i play the game in the tiberian sun firestorm with the map??
but when i enter the original tiberian sun game with the map....it's fine?

You're still giving me too little information... What mod are you trying to create the map for? Also, are you sure you ran the modified Final Sun that came with the mod to create the map, rather than the original Final Sun?

nevermind...
i hav fixed it..
thx for the information by the way!