I have searched the message board and I have turned up nothing concerning tag 45. I am trying to view my Panasonic PV-GS50 Camcorder video through a USB port on a Win2K machine. When I try to view the tape I get the following message, “The audio codec identified by the format tag 45 is required to play this file. To determine if this codec is available to download from the Web, click Web Help."