How to create stuffit files on Linux?

[Noah]

The problem is that my users want to see .sit files.
I know it's sort of silly. Zip files are foreign and frightening to
them.
I mentioned zip files, but they didn't want to deal with them.

Is there a native OS X archive or package format?
Obviously it must have tar and gzip installed, but I wonder
how a *.tgz file would appear on the desktop or how the
GUI would handle it. 

Yours,
Noah