Namely, there was a “previewer” program compiled for old macs (old macs used a PowerPC architecture, similar to the Gamecube and Wii)
I’ve been fiddling around with some of the files from the Dolphin SDK.
I had tried running this before, but got stuck on the program looking for a “prevload.txt” file in a specific directory.
After some digging around in various documentation and script files, I finally figured out what I needed to do.
The program looks for an inserted disc with the volume label “cp”. It then looks for the folder “cp:/cpdata/preview/”. This folder must contain the file to be previewed (in this case, Zebra.gpl) as well as a text file called “prevload.txt” (which just contains the name of the file to be previewed).
With all of these conditions met, the program should display the requested file.
Unfortunately my virtual machine setup seems to freeze (or in some cases crash) at this point. This seems to be an issue with SheepShaver not supporting 3D hardware rendering.
Ultimately, the next (and only) step to get this software running would be to try it out on a real old-school mac. And even if that works, I’m not sure whether I’ll be able to navigate the program (since it seems to use some sort of game controller).
As always, I’ll keep you all updated.