Now I may have a clue as to how to encode the SCN/OFF format.
I'm working on Tower1.bmp
What I am going to do is CUT out a section from the SCN chunk.
OFF is Off Sets to data I'm pretty sure.
So if I cut from the last off set position and remove the last off set information,
then change file size references? It should open and be missing 1 frame.
As far as I can tell at this point? The SCN: information does not contain the size of the file decompressed.