So, after upgrading Calibre to x64 bits, now I can't set ebook-viewer.exe as the default ebook reader (I've tried only with epubs, since I use other software for PDFs and DjVu, and I don't use .mobi files).
So, I'll uninstall, clean the registry and reinstall as indicated in this post:
https://www.mobileread.com/forums/sho...d.php?t=123664
Again, I wouldn't like to lose my classifying work on my library, so can I be certain that the tags I've made and the metadata I've created for my books on Calibre won't be deleted in the process? I'm quite confident that I won't lose the metadata, but tags and stuff that seems to work only with calibre might be affected.
What issues should I expect and what measures can I take to avoid problems here?