How to use lha -->
hereRegardless of the OS you have, you are not using icons in a MS Windows like enviroment to unpack and pack files, you are using the Shell (the Amiga version of MS-DOS) until such time as you get something else to do the hard work for you, like the afore-mentioned Directory Opus.
Persevere ... the rewards are great plus there's a wealth of help on tap here should you get stuck.