i downloaded some pc mods that suppose to be compatible with the xbox version, what do i suppose to do with the files,do i put them in the override or what?

More or less. This is from here:

KotOR 1 - E:/TDATA/4c410003/Override/

KotOR 2 - E:/Games/Star Wars KotOR II (OR SWKotOR II OR Whatever it gets named)/Override

If there isn't an Override folder in either one of these directories to start with, then you will have to create one and FTP it to the XBox.