I'm a bit late with this it seems; while Stuffit may work, DD-Expand is
freely available and can still be downloaded, so I'd use the real thing:
<http://hyperarchive.lcs.mit.edu/HyperArchive/Archive/cmp/dd-expand-40.
hqx>
(Archive abstract is here:
<http://hyperarchive.lcs.mit.edu/HyperArchive/Abstracts/cmp/dd-expand-40
..hqx.txt> )

Version 4.0 from 1994 still runs fine under OS9/Classic in OS X. :)

-Ryan

> Hi Wamuggers.  Many years ago I used a programme to compress my files 
> for storage that produced a DD file. I have now lost the programme but 
> not the compressed files :-(  Can any one help please?