srbin: no, they just run as they were native mos apps. you dont even noticed when you run an os4 app, that its an os4 app (except if it crashes the system ,but it happens with mos apps too:)
i used to run milkytracker with os4emu, but it cant be used to edit music (latancy is too high), and now, when digiboosterloader is released who wanna run milky? the playstation emulator fspe also runs perfectly with os4emu (watched a bunch of psx demos with it).
about the unrar: i cannot extract multiple rars - at least the newest ones, as i remember i have done it before. voodoo-x report unkown fileformat on the rar, while it shows the archive when i choose the .r00 file. then it crashes when i try to extract it....
the os4 version of uinrar (dowloaded from os4depot) crashes, even if i inly type "unrar ?" for help.
"golem's" unrar gives an error: no files to extract.
anyway, the "rar" situation is better in morphos than in linux, i couldnt extract one single rar wth the linux unrar, while i have extracted several ones in morphos. except these multiple rars...
DEAD pegII/G4@1000.1gb ram.radeon 9200pro
240 gigz hd.nec dvdrw.MorphOS 2.4 DEAD
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amiga1200T.blizzardppc@180/040@25.96megz ram
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zx.spectrum@3.5