I'm floored by all of the HyperCard enthusiasm out there! Wow.

I've released v1.0a16 with expanded stack compatibility -- including enough XFCN support to render the navigation menus in the "Apple Service Source May 1993" collection of stacks. This one is a huge download from the IA browser, but it's worth it. The exploded isometric pixellated diagrams are so fun to explore!