You forgot the million dollar password:
http://aminet.net/package/util/arc/lha...download this bad boy and then rename its name to simply 'lha' and place in your 'C' directory. Or type lha.run everytime you want to unarc something - I don't care. lol
lha e file.lha ram: (or) lha file.lha ram:
I can't remember if you need the 'e' (extract) switch or not. But anyway... that CLI command extracts and then places the folder/files into your RAM: disk from which you can examine the contents of safely.