More than likely your provider didn't recognize the mime type and dropped it while relaying it. From my experience with it, if fMMS doesn't recognize the mime/media type, it presents it as a button for raw download/save. That may have changed in an update along the way, but with that text, I'd bet it was the operator dropping it. Even if you got it in fMMS, it probably would show up as a raw attachment. (Though you could edit fMMS to recognize the type and parse/launch it to another app, since it's open-source. )