bzip2

bzip2 is a compression program.

The bzip2 KIO worker isn't directly usable, and is intended for use as a filter. For example, the tar KIO worker can filter a file through the bzip2 KIO worker, in order to display the contents of a tar.bz2 file directly in an Ecco window.

If you click a file compressed with .bz2 in Ecco, this KIO worker is used to uncompress it and display it as a normal, uncompressed file.

See the bzip2 man page.

bzip is the ancestor of bzip2. It's rarely used today, having been replaced by bzip2, which offers much better compression.