By modifying the contents of the demo, I was packaged in Mac OS X.
Was compressed binary data that was packaged, but the file gets corrupted when it is thawed.
I changed the decompression software, it could be safely extracted.
The following software is recommended if the file will be broken after thawing.
The simplest ways to package a Mac game for distribution is to use Apple’s own Disk Utility in /Utilities/Disk Utility.app & create a compressed disk image. This will preserve all the necessary data & give you reasonable compression ratios. Stuffit is a real blast from the Classic Mac OS past.