What you described at top is progressive download, which would not involve Wowza at all. You would have to add that MIME type if does not exist, but that involves your web server. You would also need to do that if you were using MediaCache with Wowza and the web server was the content server. If it is not configured by default you can add it following Apache documentation.
Many players use RTMP. You can use rtmp with progressive download also.
Wowza can stream video on demand and live content to Flash RTMP , Flash HDS, and HLS to iOS devices or VLC or JW Player 6 premium or above to the desktop.