For reasons I cannot figure out, my macbook pro (but not my imac) has decided to merge RAR and CBR files - changing one kind changes both.

I have Stuffit Expander for RAR file opening, and Simple Comic to read CBR files, but with this weird type merge (they all show up as 'rar cbr') this means having to right-click, open with, on every file.

if I go into 'get info' and change open with, it changes all RAR and CBRs to the same program.

There has to be a way to disentangle RAR and CBR file, but nothing I have found works. I've installed Default Apps, but the add and subtract buttons are greyed and I can take no action.