Zipper 1.2

Zipper is a tool for inspecting the contents of a compressed archive and for extracting.
I know that theres a GNUstep port of the famous OpenUp application but I must admit that for a living I have to use Windoze at work. After a while I got quite used to Winzips UI.
Although I dont like some of its features, what I really like is the content listing of an archive without actually having to unpack it. This is what Zipper currently tries to mimic. This has also the advantage that you dont have to unpack archives from networked volumes to your local disk just to view whats in it.
Zipper has a single window, that displays the contents of the selected archive.
Main features:
- Add more extraction methods: zoo,arj,rpm,deb,ar
- Display more status/progress info when archiving and unarchiving
- DragnDrop executables to the Preferences dialog
- DragnDrop extraction to GWorkspace
- Display archive structure in NSOutlineView
- Before extracting the archive, check if files exist and ask user what should happen
- Handle password-protected archives
Enhancements:
- Try to determine the file type by the files content before resorting to the file extension. This is necessary as some file extensions are ambiguous.
- I finally restructured the code so that not all possible archivers need to be filled when closing the preferences panel. Now if you open an archive that does not have a valid archiver specified the preferences panel will open.