Using Claris CAD 2.0v3 and Adobe Type Reunion (any version, currently 1.1). On some model Macs (IIfx and SE/30), XTND may not work properly. The symptoms: either the Show popup menu does not list any XTND file types, or the Show popup menu is missing entirely.
The problem seems to be CPU specific; that is, the problem does not seem to occur on a IIci or a Quadra 800. Other Macintosh models were not tested. These results are from an informal test by Claris Technical Support, not a comprehensive compatibility test.