As I don't want to mess up the IE setting just for playing this type of file, I finally figure out a way to play this Web Conference file in any Windows platform.
- Rename the file from imtPlaybackXXX.exe to imtPlaybackXXX.rar
- Use WinRAR to extract the playback directory to any place
- Goto playback\[XXX]\console\ directory. Use Internet Explorer to run the file imtPlaybackConsole.html
- Click the ActivX control warning bar and select "Allow block content"
- A new browser will start up. Resize this browser to fit your screen
- Enjoy !