De Voorkant has released an iOS 4 universal update to its archive file management application, iUnarchive. Originally released as an iPad application, iUnarchive 1.2.1 is now a universal app that can take advantage of the file management features of iOS 4. iUnarchive allows users to open and display the content of compressed files from other apps such as Mail or Safari using the built-in “Open In” option found in iOS 4. Users can then…