Video exchange format between WMP 10 Mobile for Pocket PC and WMP 11 for Desktops & Laptops

Video exchange format between WMP 10 Mobile for Pocket PC and WMP 11 for Desktops & Laptops   How do I get videos from my phone (.3p2 filename extension) to play on my desktop........ How do I get videos from my phone (.3p2 filename extension) to play on my desktop