Where039d My TXT File Go?

I'm not sure which application or service is responsible for it but I've noticed that a large number of my text files have been converted to Markdown (.md) and MultiMarkdown (.mmd) files. This isn't be so bad since the contents are still just plain text. However, several applications that I either use or I am testing do not recognize the md or mmd extensions.

Recently I went to find a file in NVAlt and it was not available. Low and behold it had mysteriously been converted to mmd. I have a suspicion that the Simplenote web app may be responsible but I can not be sure.

Rather than try to track it down, I just built the following Hazel rule as :