Convert CBT to CBR

cbt to cbr conversion is most likely a matter of export between two different comics books archives, from CBT (TAR) to CBR (RAR). The quickest way how to achieve such conversion or export would be to simply treat both files as their respective archives and repack them with any file archiver that supports both TAR and RAR formats. Might require renaming of the file extensions to make it work in some software though.