> As someone who made a great many HyperCard stacks...
I don't suppose you still have the files for those stacks lying around? I maintain the HyperCard Online project, a collection[1] of over 3,500 HyperCard stacks on the Internet Archive directly emulated in-the-browser.
I've made an uploader[2] that anyone can use to contribute their own stacks to the collection. It accepts all formats of stacks (all the .sit, .bin, .hqx-style compression formats that were common in the 80s/90s, disk images, and just raw HyperCard stacks).
It's always great to see what stacks folks are uploading - recently a large number of Japanese stacks were uploaded, covering a wide range of topics.