Quote:
Originally Posted by Timboli
Amazon started with something like MOBI, then moved to AZW, then moved to AZW3, and now have XLF. The only two extensions that appear in the My Kindle Content folder for Kindle For PC, are the first two, MOBI and AZW ... even for the most recent purchase of two days ago. On my Kindle Paperwhite 2, all four extensions show up.
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AZW is Mobi (or was, see below). I have no idea what XLF is, but perhaps you mean KFX.
At this time file extensions mean little for Kindle, especially Kindle for PC. AZW can mean AZW/Mobi, AZW3/KF8, AZW4/Print Replica PDF, etc. depending on where it's being delivered. The way most "regular" Kindle books (linear fiction & non-fiction) are done a hybrid file is created using Amazon's publishing tools and that file contains both Mobi and KF8 (along with the ePub source if it's an ePub conversion). The file your individual device gets depends on the most advanced format your device/app supports. Some books are still uploaded by the publisher as only Mobi & some have been on sale long enough without updates that the only version is a Mobi as well.
KFX is a different beast and is only obtained when doing a direct download to supporting devices/apps.