I'm using 7-zip with file-roller, and you're using unzip. That's the clue.
I've tried it from the command line: unzip works, but 7z doesn't. Searching around the web, looks like 7z has bugs -- and the purported fix (install p7zip-rar) doesn't seem to fix it in this instance.
File-roller uses 7z; so it doesn't work, but only after Viewer recompresses it -- it works fine opening WinZip'ped files. (My script runs in a virtual machine.)
Workaround is to ditch file-roller and switch to xarchiver. So thanks for the clue.
cap
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