Yes, VLC will play the stream directly, over my home wifi, from mediatomb installed on the satellite receiver.
The files are H264 MP4/MP3 in a .ts container according to VLC
I can't find any downloadable plugins that match the one required.
The web interface for the receiver has an icon for the recorded content, if I click on a file a new browser window opens and tries to stream the content in an embedded window.
EDIT: The file streams in a Firefox browser window in Win7 with no additional plugins
This is what happens: (solved image linking using tinypic)