Help - IDM Download help

Hi,

I have a premium membership in FF.

I am using the IDM for download. I have logged into FF. while clicking the download links , idm does not catch the link, the download starts as normal windows download without idm. It happens only when i click the links which does not have any extension. for eg this thread http://www.xossip.com/showthread.php?t=1298526&page=13. its always downloads without through idm

If there is a extension mentioned in the file name, IDM automatically pics the links and download starts.

kindly suggest me the steps , to download through IDM.

Thanks