So that is 3 sources that all use different zip libs, Calibre, Sigil, and Windows itself ....
so something
- has corrupted all your epubs (unlikely)
- something has encrypted all your epubs (ransomware but unlikely).
- something has disabled write permissions on your temp folder?
- or you do not have the proper permissions somehow
On a mac iBooks unzips epubs and replaces the .epub with a folder. Could these all have been unzipped and the folder renamed to .epub somehow?
One other thing to try is to create a second user account (not Lenovo) and login as this new user and try opening a zip archive as that user. A new user account should have proper permissions set at start-up.
Not sure what else to try. If you have access to another computer you might try copying the epub renamed to .zip onto a usb key and trying to unzip the file on that computer.
If that works, then the file itself is just fine. Pointing us to a permissions issue of some sort.
Quote:
Originally Posted by ReaderofBooks
Hi. Yes, that also created an error.
Copied file to desktop, renamed the file extension to .zip
Double clicked it.
Window appeared stating;
[Compressed zipped folders error]
Windows cannot open the folder
The compressed zipped folder 'C: etc,etc' is invalid
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