TODOs:

- allow multiple select in the browser window.
- add more formats (lha, arj, ??? --> look in Opener sources)
- allow users to specify which gzip/gnutar/unzip binaries to run (dwrite)
- move the commands section into a configuration file, so users can customize
- do something like Opener does and open a new File Viewer on the directory where files are extracted to
-might want to ask users if the archive is really big, since they can't do anything with the workspace while the file is listed (which can take a while, esp. over NFS or in DOS filesystems)
