[jibal]

You guessing, based on an overgeneralization of "too heavy" (the context was quite explicitly opening a single file outside the Obsidian vault--nothing about electron), that it isn't what they're looking for provides no value to me (or to anyone else, for that matter). I was simply trying to be helpful; if marktext isn't what they want then they won't use it. The same for the other solutions I posted, such as using pandoc to generate html from markdown.