I have notice that this object has some seriously messed up collision geometry on it, and I wonder if their is some way to get around it. I tried putting -nocollision in the .msh.option file, but that didn't do a thing.

If you want to remove collision, add these codes to it's odf file.
SoldierCollision = "none"
VehicleCollision = "none"
and OrdnanceCollision = "none"

This object uses a combination of normal collision and primitives for soldier and ordnance. You could hex out the primitive collision easily or completely rebuild the collision however you want it in XSI. What you plan to use this object for would determine what collision modifications need to be done.

I don't have XSI or the skill to use it. However Anthony's fix works for what I am doing.

You can also use Blender. I find it much simpler to use. However, you can only export props properly.