Yeah. I saw the Script-Fu (and Python) sections. I'll probably just dig up a tutorial somewhere. People do seem to love their Python, so there's bound to be something out there, I just need to dig around a bit.
I tried the soft reset and things were still locked. I then accidentally renamed one of the animation files and, lo and behold, I can rename things. Windows' file system confuses me. So I went and renamed all of the animations 1-45, copied in the new animations, and it works fine. The icons deleted without any issues.
After loading the new images the 1-45 files can be deleted, and the new animation files are locked. The icons can be overwritten without a problem. I think I'll play around with MortScript a bit so I can automate doing all that nonsense.
Thanks for creating this thing in the first place.