Download ZIP Reader
ZIP Reader is not the usual kind of compression software you might get your hands on. It does not really have too much to offer to you so if you expect too many features, you will be disappointed. However, you will find it more than useful when it comes to decrypt files encoded with PKWare software.
Regarding the interface, it could not have been simpler, you just have to search for the file you want to extract and then hit the extract button. Simpler things than this are rare, this being an advantage for ZIP Reader, which can be used by anyone.