This is no longer true. I'm currently using the In port and Out port functions with W2K. See http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DEBD56A4E034080020E74861&p_node=DZ52058&p_submitted=&p_rank=&p_answer=&p_source=External, download and install AccessHW.
You must then use the functions that will be copied on your hard disk in accessHW_LVX.llb.