I looked the the tutorial and I remember about how there were more units at the campain creations site than just the Infested BattleCruiser. If I had some custom sprites for units but the sprite I made lookes nothing like the unit (just like some of the units on the site) how would I be able to input my sprite into the certain file type without having to do all of that stuff with pulling out the BMPs and what not?
Instead of using the GRP that retroGRP spits back out once you have done the BMP editing, use the GRP that you downloaded and wish to use. Remeber to rename it to the same name as the file you are replacing it. You can see this done in Chapter VII with the implementation of the infested BC graphics.
Thanks for the help. I know about the whole renaming the file and what not so I got it from here.