Various companies create add-ons for Microsoft Flight Simulator in the form of aircraft, scenery, airports, and such, as enhancements that you can buy and load into the program. Why? Dunno, why not, I suppose.
ANYway...
A company called Aerosoft has just released a Twin Otter add-on that has an old friend in it. It's not quite right in a few places, but it still made me smile when I saw it.
http://www.fspilotshop.com/popup_user_images.php?peiID=200&osCsid=584663738e09199a9a66bdc28c872a2c