Here is how to control which application Firefox uses to handle MMS streams:
Type about:config Firefox address bar.
Right-click on any text in there and select “New” and then “String”.
In the first dialog box, as preference name, type network.protocol-handler.app.mms.
In the second dialog box, as string value, type in vlc (or the path to your favorite media player)

Here is the command to use to mount an ISO file in Linux so that you can explore the file as if it were mounted on a CD-Rom or DVD-Rom, without having to burn to a disc:
sudo mount -t iso9660 -o loop filename.iso /folder/to/mount/to
This functionality is similar to Daemon Tools or Alcohol on Microsoft Windows.