In order to solve Users are not able to browse cbz files using the right arrow key (although it works for cbr files), two file types are recognized in KrServices::generateKrarcArchiveMimetypes().
There's related information in:
- the code review Identify the "application/vnd.rar" MIME type in order to allow some operations, although there the changes are related to KrArcBaseManager::getShortTypeFromMime(const QString &mime), not KrServices::generateKrarcArchiveMimetypes().
- https://bbs.archlinux.org/viewtopic.php?pid=1656582#p1656582 , where it was said: The mime-type for "cbr" and "cbz" files changed with version 1.7 of shared-mime-info: https://cgit.freedesktop.org/xdg/shared-mime-info/diff/?id=Release-1-7
Note: cbz files are easily made, for example you simply compress some images to a zip file, change the extension of the zip file to "cbz", and that file can be viewed using e.g. Okular.