[LIJI]

Alright, using Paul's editor, I

1. extracted MIPATH.bnd from the original mi.lvl
2. deleted MIPATH.bnd from the original mi.lvl
3. added the extracted MIPATH.bnd to mi.lvl
4. saved

And the resulting .lvl was enough to crash Exoddus. What's the version of Paul's editor I should be using?

I'm not exactly sure what you've done, but to change a level you do this:

1. Extract the .lvl file to a new folder using Paul's extract.exe
2. Extract MIPATH.BND using my level editor
3. Modify MIPATH*.path as you wish. Use the compile option to save and use file you loaded! not MIPATH.bnd!
4. Using my editor, use the Rejoin BND option and choose the MIPATH folder. Do NOT choose any other folder! Only the folder containing .path files! A new MIPATH file should replace the new one
5. Rebuild the lvl file using Paul's builder.exe