Can I search for files by type code?

I just tried to open a document that I created in Microsoft Word 6.0 ages ago, only to discover that Word 2016 couldn't open it. Fortunately, Word 2011, which I still have, was able to open and convert the document to a format that Word 2016 can read. Since I have many old documents that I don't want to lose access to, I'd like to be able to search for them and convert them while it's still possible.

So the question is how to search for them. Because these documents are so old, they don't have MS-DOS-style filename extensions. They are from the golden age when the resource fork of each document contained a "type code" and a separate "creator code" to identify the document type and the application that created it. For these old Word documents, the type code is W6BN and the creator code is MSWD.

The easiest solution would be to search by type code. But I can't figure out how to do this. A Spotlight search for kind:W6BN yields no results. Simply searching for all Word documents and then limiting the results by date yields way too many false positives.

Does anyone know if there is a way to search by old-school type code? Or does anyone have other suggestions?

Thanks.