[Ripplinger]

In the past I've been saving all formats of my ebooks. When I purchased them, I usually downloaded all formats just in case; when converting where needed, I always saved the old formats even though I didn't use them. But I've come to realize I'll never ever use anything except epubs, there's zero chance of me ever switching to a Kindle for instance.

So I decided to just clean up my library and delete all the various .mobi, .lit, .txt, etc. files I converted from. I was hoping there was some easy way through Calibre to do it without going to each individual book and right clicking the format and selecting delete, because there's several hundred of them.

I tried deleting a file through Windows Explorer, then reopening Calibre, hoping it would no longer show the format just deleted, but that doesn't work... the format you just deleted is still shown in the description until you manually delete it under the comments section.

Is there any way to do this that I'm missing? Or a way to force Calibre to recognize that some files have been deleted through Explorer?