Originally Posted by kovidgoyal
Does that happen for any format removal or only the last one for a given book?
Any format. Well, I only checked for html and rtf. What I usually do, I import a an html or an rtf file, edit its metadata and convert it to lrf. The I go back to the edit metadata dialog and remove everything but the lrf file. What happen then is that the files are removed from the program, But they still remain in the directory.