I was having Microsoft windows XP operating system installed on my desktop. I have installed iOS 4.2.1 version of operating system because of its advanced feature such as it has in built AirPlay and AirPrint software which are compatible to all devices. Last night while browsing the internet I found new released movies, so I downloaded. The movies are in .mkv file format. I want to know that I can play these movies on my IPad. Also tell me I need to download some converter which can convert these mkv file format so that I can play it on IPad.