I have this MSI X58 Platinum board and I cannot get HDV/.m2t files out from the firewire / IEEE1394 port.
DV out works fine.
DV and HDV in work fine too.
This is independant of the software used ( in this case Newtek SE, VT or Sony Vegas ).
The files work fine with a Sony laptop and a 7 years old SuperMicro workstation.