On a Performa 6214 (PPC 603) running MacOS 8.1, viewer.app (of the M5 release) failed to load, giving an error message saying that the ATSUnicodeLib could not be found. On a beige G3 (MacOS 8.5.1), I didn't have this problem. On that computer, the ATSUnicodeLib is found only in MPW:Interfaces&Libraries:SharedLibraries: (I just happen to have MPW installed on that machine). Putting the ATSUnicodeLib on the Performa, either in the System:Extensions folder, or in the Mozilla folder itself failed to solve the prob

ATSUI doesn't run on Mac OS 8.1, that's why the library won't load. There may be a solution for this in the future. We should be able to wink link against the library, and check for the existence of ATSUI, if we have alternate code paths to go down. Reassigning to international group.

Updating QA Contact

The OS 8.1 out-of-the-box is not supported, you need 8.5 to run the current builds. By the time 5.0 is released, we'll offer a compatibility with 8.1 through CarbonLib from Apple. Closing as Invalid.