Uninstalling does not change the Library or settings.
Are you saying that you can't USE THE OS to (default) open non-book files?
This is a File Association issue.
What you may need to do is open the APP you want to normally use and have it take BACK those associations (as the Default App)
I had that happen on W10. I blamed a fumble finger... but,
maybe Windows is making these types as the Default, instead as simply registering that Calibre is CAPABLE (place on the right-click 'open with' list) of opening.
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