Correct, 26.1

macOS Tahoe?

All unit creation, animal, character, vessel, and building sounds are currently missing in my game, although attack sounds, the flare marker sound, and other effects still play normally. I am using a MacBook Air M1 and have already attempted a full reinstall of 0 A.D., including deleting all related files and even reverting to a previous version, but the issue persists. Despite these steps, no ambient or interaction sounds (such as movement or construction) are restored. No errors pop up either. 

Let me ask to an expert. @Stan` Have you ever seen that format? Another person you can ask is @nifa. Apparently with pluggings in Blender.

I can find them, but how or with what program do I convert them to .CEM format? (That's the format the mod uses for models.) Another detail: I can only find objects separately, and in the 0D.C. editor, they're displayed both in parts and as a whole, but the zip file you mentioned only contains parts. And yes, you discovered this possible surprise (if I manage to extract it successfully, of course).