Join Date:Joined: Nov 2010
It depends on the type of file
Documents you can do a save as and make them available in the office hub
Pictures are available in the picture hub
I don't believe you can save music and videos, those are likely being stored in temporary internet cache that you don't have access to. If the zip file was in your email, you'd be able to open it again from the email attachment (potentially without having to download it again).