How to find all Hypercard documents in Leopard?

Question

When I upgraded to a Mac Pro from a G4, I lost my ability to work with Hypercard (I do use Sheepshaver occasionally, but it crashes frequently). I recently purchased Supercard, in order to be able to continue to work in a Hypercard-like environment (and it works great), but I have to convert my Hypercard projects and stacks to Supercard format.
I have several old Hypercard documents scattered throughout my mac's hard drives, and want to be able to find them all using Leopard's find abilities. However, I have discovered that (unlike in Tiger), Leopard cannot search by Creator Code or file Type Code, only by "Kind". When I try to search by "Kind" for "HyperCard" or "Hypercard Document" (Leopard displays the latter in the Get Info box for a Hypercard stack), I get no results. It works for "Microsoft Excel", but not for Hypercard.
None of content, size or date help work; there is a wide range of stack sizes and date (I was working on various projects from the late 1980s through last year). Content varies widely as well.
Any ideas on how I can find all Hypercard stacks on my drives? Perhaps there is a 3rd party tool that allows me to do this (I've searched with no luck on this front yet).
Thanks!

Answer 1

I tried this and it works as you describe, but not all Hypercard documents appear to have the same content type, as described by Terminal.
The first Hypercard stack I tried came up with the content type:
dyn.ah62d4rv4ge8xe6u
The search only found the one result with this type (the same stack).
Then I tried using the Hypercard "Home" stack (a pretty central stack to Hypercard's functioning), and it had a content type:
dyn.ah62d4rv4gk8zgzcbmq
(note the type is longer with a different ending; only the first 14 characters are identical to the first stack).
This search found 317 items, which is likely most of my Hypercard documents, so this is some progress.
Unfortunately I know that since the first stack I tried had a different content type, there may be other Hypercard stacks on my hard drive with yet a different content type, not caught by these searches.
I then tried a wildcard, thinking that if only the first 14 characters of the content type are identical, I focus my search on those characters only, using asterisk as a wildcard at the end. So I searched for:
dyn.ah62d4rv4g*
The result was 526 hits, including many documents that are not Hypercard. So this doesn't help.
It appears that the content type is not exactly specific to a the File Type or Creator Code, so while I can find many of a particular document, this method cannot find all of one type of document.
I tried searching using raw query by the Terminal-reported File Type Code (kMDItemFSTypeCode= "STAK"), but this revealed no items.
Perhaps I should suggest this to Apple as a bug fix for Leopard, to restore the ability to search by Type Code or Creator Code as a choice in the OS Find service? I know these codes are no longer relied on as much as they used to be, since now the OS uses extension as much as anything else, but there is lots of older software that still run in Leopard that use Type and Creator codes. And Apple still recommends registering the creator code of any new software.
Thank you!