[DiapDealer]

When launched via CC, the file is being moved to the Mantano/books folder (which doesn't happen when doing an import from within Mantano). It tries to do this each time you try to launch the book thereafter (and fails because the file is no longer where CC thinks it is). When you use Mantano to delete the ebook file, it deletes the file from that new location. Run CC's "Find books with missing files" search AFTER you try to launch the ebook but BEFORE you delete it from within Mantano. You'll find the file is already "missing." A file browser will allow you to find it in the Mantano/books folder and return it to where CC expects it. You'll still need to delete its entry from Mantano's library to get back to where you started.