This might become the most stupid reply of all times, but... Well, 3DMF is Apple's QuickDraw 3D format but Poser4 seems to support it on PC. I just tried it under PC emulation, and it had a plug-in called "FF3dmf.arp" which suspiciously looks like a 3DMF module... Poser also shows "QuickDraw 3DMF" as importable format in its menu. If it fails on your system, then it could be either that you accidently deleted the plug-in, or you got a damaged file?