[Tenome]

Thanks for the replies, I'll see if Calibre can manage it somehow. The reason I'm trying to homogenize the epubs is so I can mass-replace the CSS file inside with my own. Calibre sort of has that option when converting, but it renames the classes and throws out everything that isn't used, which I'm trying to avoid. So I'll try ebook-convert.exe. The Arrange into Folders option from the editor seems to be exactly what I'm looking for, can't believe it's not a command line feature!