Note: if you are looking for RAR or UnRAR for Mac OS X on PowerPC, see my Last versions of applications for Mac OS X on PowerPC page.
This is an unofficial port of UnRAR 3.9.10 to Mac OS. It runs within the MPW environment.
It has only been tested on G4 computers with Mac OS 9.2.2. Older PowerPC processors and Mac OS versions should work. (It may be possible to compile it for 680x0 processors, but it would be extremely slow and the memory requirements would make it useless for most 680x0 computers.)
(The reason I ported 3.9.10 and not a later version is because this version can be compiled for Mac OS with relatively few changes while 4.0 and later require various Unicode-related functions which should be possible to implement, but are not present in MPW's implementation of the standard C library. Maybe another time.)
Updated on with additional optimizations.