Streaming data to microsoft windows operating system

Question

Hi all, I'm trying to write an application to pass a stream to OS. For example receiving a WMA file using network stream and passing it to the OS so it will be opened in default media player. Or in another scenario, Decrypting an encrypted content like a 4GB movie stored in hard-drive and pass it to the default media player just in time, I mean as a block is decrypted using cryptoStream, So we don't need to store another 4GB on the hard drive.