Hmm, maybe I should make my own program for converting the .grp files.
I already have a good understanding of the .grp format; I made a library for displaying them. I could just make code that does the reverse of what that does.
And then from there do other stuff with it.
Even if I only added support for creating .grp files in my grp library, that would at least help someone else make a program for doing what you want.
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that would help alot and make grp editing take up less room (I tried to make a program for it, but failed