Both cbr and cbz are just compressed archives - R for Rar and Z for Zip. The format has got nothing to do with how the images are displayed in a reader application.
If you want any reader to read a comic frame by frame instead of page by page, you'd have to uncompress the file, then cut out each individual frame and give them sensible names (eg. page_39_frame_03.png or somesuch) and then recompress.
Someone else in the thread mention software that can do this, but it might not always work as expected, when the layout is not straight-forward.
Der er folk der udtaler steak rigtigt og så er der folk jeg aldrig tager med ud at spise.