MS Player V9 and Netscape 7.2

If I wish to open an wmv file, I open Windows Explorer which
in turns opens MS Media Player V9 and the file is shown properly.

If I try to open an wmv as an attachment in an incoming email, the
MS Media Player opens and displays the following message:

"Windows Media Player cannot play the file because the specified
protocal is not supported. In the Open URL dialog try opening the
file using a different transport protocol (for example, "http" or
"rtsp").

It appears that I have a proper association in XP but something
is amiss in Netscape. I hope someone can solve this problem.

TIA

Jerry