Wow, after reading the whole thread and others elsewhere, AND learning about how zip files need to be unzipped on the core from WITHIN the core by somehow getting QL's unzip program onto my SD card (which ironically is itself zipped), this seems way too complicated for me. Utility tools aren't compatible with my OS, I can't convert anything to the required .MDV format and even if I can, most of the commercial titles I'd like to mess with are locked away like a Disney vault.
The QL computer may be THE most complicated scenario I've seen yet!
QL forums seem to agree that the core is great work so the platform is there to get better. I may revisit this later in hopes of a simple .MDV collection can be found or easily converted with a simple new utility. For now, I never had a QL so I may live the experience vicariously through other people's videos. I do admire the dedication of everyone to get things working.