You would need to explain better what you are trying to do.
A .asx file is a redirector file for http,mms,rtsp protocol Windows Media streams.
These are rtmp protocol Adobe Flash Media streams.
If you are trying to download the streams try StreamTransport
If you are trying to embed the streams in another web page, click on the Ustream or Livestream logos on the streams and that should take you to the source page where you can get the embed code.