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The ZipXtra and UnzipXtra are part of the standard Director installation for DMX 2004. I assume that you are authoring on a PC, so you should simply be able to add the xtra to your projector's xtralist (Modify, Movie, Xtras). Then publish the movie for Mac and it should include it for you.
If for some reason the xtra does not work, you could try a 3rd party one, like Valentin's free zlib xtra
Thanks for the quick response.
I was able to track down a Good Samaritan who passed along the Mac Unzip Xtra.
When adding the UnZip Xtra via Modify>>Movies>>Xtras, and without the Mac UnZip Xtra in the local Xtras folder, my application fails with a Script Error (probably at 'pZip = new (xtra "UnzipXtra")'.
When I include the UnZip Xtra in the local Xtras folder, no Script Error.
I have secondary problems of course. The file downloaded is now unzipping but the result is incorrect. It looks like the first alphabetical filename is longer than 31 characters. Mac Unzip truncates that name and refuses to properly unzip any of the other 14 files and 1 folder (some with names shorter than 31 characters).
Unless someone out there has some Mac UnZip-fu they can pass along, I'll do some further tests with shorter file and folder names and, if ok, encourage my Client to rejig his workflow.