Note: The method mentioned below might work for other versions of Internet Explorer. This has been tested with Internet Explorer 8. (Mention build number here).
1) Download installer by typing following URL http://<infracc-server>/infracc_client.exe in your browser
2) Run the downloaded installer.
3) Now try opening a vm console using Internet Explorer. Internet Explorer will open a "open with" dialog for the VMControl.infrc file that gets downloaded. Browse and select C:\Program Files\infracc\infracc_client.bat and check the Always use this program to open this type of file checkbox.
The bat file may not be visible directly in the selection window, in that case select "All file" option on dialog box to list it.