Attempting to open an ArcView project from version 3.1, 3.2, or 3.2a in 3.0a or 3.0b returns the following error:
Unknown Object "DocAct.5" in Project
The project was saved in version 3.1 or 3.2 with the Dialog Designer extension loaded. The Dialog Designer extension was not packaged with ArcView 3.0a or 3.0b. 'DocAct' is a Dialog Designer extension object and requires that the extension be loaded.
ArcView 3.0a is for Windows and Power Macintosh and 3.0b is for UNIX.