Iwzip is not a valid zip file - File Export & Import errors 
Автор: Les L.
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I have got multiple errors while trying to back up a Evolution 10 website file & when I tried to import again on same computer after having to reinstall operating system. see attached error screen shots
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eRROR PIC
Hi Les,
in order to fix your exporting issues proceed this way:
Enter the folder "Library" given in the error you're getting.
Look for a file named index.xml and rename it to something else
Rename the file backup.xml to index.xml
Take note of the ID of the item inside the library that is giving the error (in your case I can see that it is 8xh98xf47jca55i42541s412du0s0tj4), open the new file index.xml with notepad or similar and eliminate all the <source> tag for that id
Let me know if you have any trouble