You can only launch multimedia files such as audio & video using LW. To open anything else, go to your LW Library window & select either Saved Files folder OR Shared, & then press the Explore button. This will open the folder up for you. You can then drag & drop the zip file onto winzip or winrar or StuffIt Expander or open one of these utilities separately & direct them to the zip file. The default location of your downld folder is: C:\Documents and Settings\"your account name"\Shared
I know with Winrar there is actually an option to unzip or unrar a file in the menu when you choose info about it. So select the file & choose File properties.