While the Apple II version of GEOS was never as popular or well-supported as the Commodore variant, there are still a few within the A2 community who enjoy this early GUI. Oliver Schmidt has taken the time to dig a little deeper into GEOS, and having discovered the secrets of the file structure, published his findings over at cc65.org. Says Schmidt:
Although the Apple GEOS filesystem is based on ProDOS 8 the Apple GEOS files are not standard ProDOS 8 files. I’m not refering to file content here but to the file structure – meaning that Apple GEOS files aren’t seedling, sapling nor tree files.