As pointed out on MacUpdate, The Unarchiver defines for the system the filetype of "RAR-Archives" as files ending on .rar, .RAR, .r00, r01 etc., as well as .001, .002, .003 etc.

The problem is that multi-part split files also end on .001, .002 etc. The Unarchiver is unable to open/merge these files (which I would not expect it to do, anyway - it is an unpacker, not a filemerger).

I cannot dissociate .001-files from The Unarchiver without dissociating .rar-files as well, since both are defined for the system as rar-archives.

I would like to propose, that in the preferences a seperate filetype for .001-files ("Multi-Part Document"?) is added, which can be ticked or unticked to be opened by The Unarchiver. That way, the user can choose if he wishes to open .001-files with The Unarchiver or a different program.

I hope that is not too much to ask. I feel the program is amazing, and the developer has been doing a great job!