MDF and MDS files are CD or DVD images file. You will need to use special program to open and burn them. Below are a few programs that can open mdf and mds files.
You can use the above programs to create a virtual drive and then mount to your mdf/mds folder to load the image. This way you don’t need to burn them to CD/DVD to watch and can watch them on your PC.
We found that MagicISO MagicDisc is the best for mounting virtual drives.
– MagicDisc Virtual Drive http://www.magicdisc.net/setup_magicdisc.exe