See:
What: I’d like Obsidian to be able to read and save files as .txt as well as .md, with the same file contents.
Why: Interoperability that would blow my mind!
I’ve been using Dokuwiki for years for one of the same reasons that I’m excited about Obsidian: it runs on a directory of simple text files. This makes it trivial to keep and sync a local copy of the pages, refactor things wildly, and pull text out to other systems. I have a plugin running on Dokuwiki that lets it read Markdown, so the …
Note that a recent release introduced a preference for handling non-markdown file formats. They are not rendered but instead launch in the default application.