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It's probably because they never cleaned up properly, when adding all the "Great! New! Features!" of winio, so they probably access a function for multi-disc zip files in a millennia-old library, without having fully disconnected it from another function (either in the same library or another), which is no longer in use -- so it won't go away because there's nothing to terminate it.
There are lots of such "added extras" in winio, which is why pop-ups, taskbars, and other basic screen objects sometimes behave oddly.
Remember: You are the tester.
I wanna be a eunuchs developer! Pass me a bread knife!
added extras? no. yet more proof it's built on top of the old code base.
(wasn't there some bug just last month that also was in every versions of windows up to 10 in which they admitted it was from some really old win2k code STILL used inside w10, and forgot who it was trying to convince me a month or so back that they had rewritten almost the entire thing.)