HaloMods "Classic" Read-only Archive

I was wondering how to swap the banshee for something like the rocket (from a rocket launcher)
i tryed to swap it but it wouldnt let me play the level...it always closed and said gathering exception data

I think i might have missed a step or something so if some1 could help me that would be great

i never tried this before but try swapping in the [mod2] tag in HHT.