It is now possible to choose whether an opened file shall be rendered as Markdown or just as plain text. Based on the file name ending, it can also be chosen to render all files of a type (i.e. with the same ending) as Markdown or not.
This is the first release that also contains a Mac package (DMG for ARM).
Note: there are some usability issues currently and the application is not much tested yet (or much used by the author in practice). Future releases will hopefully bring improvements in this regard.
Also, the package is not signed, so expect some hassles at installing.