@foone
There are, however, plenty of tools that convert markdown to HTML, and VB6 is able to display that.

So all you need is something that runs in your build system to convert the markdown to HTML and you're golden.

According to https://metacpan.org/release/BOBTFISH/Text-Markdown-1.000031/source/Makefile.PL, perl's Text::Markdown runs on perl 5.8. I would be very surprised if you couldn't get that to run on Windows 98?

But then, big amount of yak shaving, that.