For now doesn´t have any documentation regarding MROuter. I'm doing for my self. I'm implementing a Recognizer that will listen when a MRouter connection start in the phone. At the PC Side you have to Register and hack for you self the MRouter Components and its a Hard job. Anyway it's possible but it's a long job to understand the MRouter API without documentation.
opening the VB one a machine with the PC Suite installed gives some type library such as the ECFileManagerViewSupportS interface, which should give high level file transfer capabilities; however, there are no documentation around at all.