Searching for .wmv Video Files?...

I notice that Shareaza doesn't show .wmv in search results for video searches. Is there a reason for this? How can i change this or should i not change it? Thanks in advance for any input on this.
Bringing P2P Together
https://shareaza.sourceforge.net/phpbb/
https://shareaza.sourceforge.net/phpbb/viewtopic.php?f=3&t=707