Please help, /hbg/,

So I downloaded XDXMulleter in hopes that I could open a Xbox game .ISO. Doesn't allow me to extract the ISO.
I've read a fix for Gauntlet Dark Legacy is to remove the movies in the MOVIE folder of an extracted Xbox ISO or XISO version of this game.
I just want to convert the extracted content (disc?) into XISO.
Pic related. I think this is the disc extracted. How do I convert this to XISO?