Replying to a problem with Sexton Blake Library scans reported by 3thinker in his greetings thread, I found that several of the scans on the Sexton Blake Library page have .cbz extensions. Most of them are my scans & I never make cbz files. I downloaded the one 3thinker mentioned as an example (a Bogof39 scan) & found (by running a par2 check) that it is, in fact, exactly the same file as I have, but my copy is .cbr. I then downloaded one of my own scans & saw that had had the extension changed too. I checked another, but that was fine. The 2 minute rule has prevented me from checking them all, but every file in this section should be .cbr as far as I'm aware. The misnamed ones will work fine in some readers, but throw errors in others.
Dave (CJ)