Troubleshooting a broken unit

[rebelyell2006]

I don't know what happened (since I haven't fiddled around with the units in question for about a month), and whenever I try to start a custom battle with Musketeers, Janissary Musketeers and Cossack Musketeers, the game CTD with a " Uh oh. This isn't good. No idea why, but exiting now. Sorry pal." message. Now to find the problem, I went through the following steps:

-verify that there is no problem with the EDU file, and there is none (by looking at backup file)
-verify that there is no problem with the modeldb file (all mesh and texture files are correct, and I cannot find any spacing or syntax errors)
-verify that there is no problem with descr_projectiles (by replacing modified file with vanilla backup

Are there any other files that would be specific to musketeers, gunpowder units or musket_bullet besides the three above (that I might have corrupted or accidentally deleted)? These are the only three units that are broken, and it is more than coincidental that it is the three musketeer units.

[Taiji]

Verify that the skeleton/animations set they use exists. Look at them in battle_models then make sure they're set to use stuff that is properly listed in descr_skeleton.

[rebelyell2006]

I never even thought of that. And it turns out that is where the problem was located. Thanks!