While yes, your solution easily works it is not what the author is aiming for. If I send you a PDF you have a multitude of options on your phone already preinstalled that can open and view the PDF. Any browser does the trick at this point, easy 100% coverage across all devices. But if I send you a .md file a browser does not show the rendered content but the raw markdown which is not the expected behaviour. Markdown is so simple there is really no excuse for it to be so complicated to open what is basically just a fancy text-file. It is 2026, it should "just work", no AI needed.