NCF – Extended list of Neutral creatures.

Well, that's not a question for me.
If I were to try, I would set a jump to the end of the file (there are many useless zeros there) and then a reverse jump. You can see in IDA where exactly to jump; it disassembles everything quite well, and you can find the list of IDs in the exe file there.
There is, however, one thing: you can't reassemble it afterward – but there's a hex editor for that!
P.S. As for those who actually edited the exe, they seem to have taken a different approach – when I compared the NCF exe and the original, the zeros at the end of the NCF file seemed to be the same.