How can windows phone use something like OnSerializeNetworkView????

Hello!. I just finished a small demo of a project i am making, and the game features cross-platform multiplayer. Or at least, i did think so. I am using NetworkViews that synchronize a version of the old (but good) NetworkRigidbody Unity Technologies provided in a tutorial years ago.

It works, and it works good, and i have the thing running in android and iOS perfectly, but when i try to build for WindowsPhone, i get compile errors regarding the BitStream parameter the OnSerializeNetworkView function receives.

Has anyone managed to make this work? How??