I was about to send you info from this page.

http://xahlee.org/UnixResource_dir/macosx.html

which suggests using ditto, and has info on how undo it with the  
command line and other useful things.

On May 8, 2008, at 9:20 AM, Mark J. Reed wrote:

> Hm.  Looks like ditto creates ZIP files with the resource forks
> included.  It uses Yet Another Naming Convention, which means that
> unzip(1) won't restore the resource forks automatically the way it
> does on Finder-created archives, but as long as just double-clicking
> the archive does the right thing, that should be good enough..
>