This is basically an unusual problem and I don't think there's anything we can do about it BUT I will tell you the problem.
I have a backup on all of the books I downloaded to my kindle, copied the books and put them in my folder. Today I opened the backup folder and instead of the cover picture and book files of each books, I just found a .APNX and .MBP1 and .MBS file. I checked the original kindle and it is the same thing so when I copied it it was probably already like that. ALL FILES ARE READABLE ON MY KINDLE. So what is the problem? I want a backup, and to be able to read it on my computer. Usually, I can go to /Calibre library and copy them back. Here's the catch: They're not they're since when I downloaded the books, my computer broke and when dell fixed it, they cleared my drive (with permission).
I searched it up and apparently APNX is an indexing file and the others I couldn't find anything. So can I convert? Calibre and other converters doesn't support it. I don't know what it is, but it has to do with a kindle update. Please come back to me if this is unfixable, and I just have to deal with it.
