There is a Book on Google Books about FileMaker 5 that probably has what you want:
From Amazon, it says it works on Windows NT and Windows 98 (oh my!).
But you are correct, there is nothing officially from FileMaker on the web according to Google and Bing.
You probably need to contact Customer Support and request such documentation if you really need it offiically.
Thanks Taylor. I contacted my BAM, Mark Ringo.
Thanks Greg. I agree. I think it would be nice to have the information still in the Knowledge Base. Thanks for the link - its the same one I have in the original post.