I know it's been like 4 years since, but I recently got a longing to play Dune II again and was looking for custom scenarios to play and I noticed a mod on moddb called "2019 NewMissions" (not going to post a direct link cause it contains more than just the missions if you know what I mean) and I noticed it's identical to your file "dune2_missions_mrXyz.zip". Did someone reupload your file without permission, is one an older version or what's the deal there? It's worth mentioning some of the file checksums are different. Anyways sorry for bumping such an old thread at this point, but I wasn't sure I could justify creating a new one when one with an identical topic already exists.
P.S. you might also want to preserve the save scenarios here and here (second to bottom). Note that I had issues with the second URL so here's a direct link to an archive.org copy just in case. Now if only these save scenarios could be converted in to standard ini mission format for use in source ports, and at that, if only the source ports properly supported custom single player scenarios. *sigh*
A tiny bugfix release from 2022-06-30:
Fixed: Buildings not providing build radius at all
Fixed: Broken powerbar and building/unit icons after switching side
Fixed: Wrong mouse cursor for engineer and saboteur on non-targetable buildings
First post edited and download link updated.