Is there a way for it to determine if a cbz/cbr file is labeled incorrectly and possible correct it in the program then continue the conversion? I have some downloaded manga. They incorrectly put the extension as cbz when it was originally a rar file. The calibre gui just said it was not a valid zip file. So I had to manually go through about 300 chapters and labeled them correctly. Before I found that out though, I thought there was an issue with the program itself and unzipped then created a new zip file. Either way was not pretty.
I also found a nice program called "Better File Rename" which has to be the best program I have found to massively rename files however you'd like.
I am using the latest calibre and the gui.
Just a way the program could be made better. Maybe a prompt to warn you that it is incorrect before applying changes.