Thanks guys!
The plausible one is from "Pothole Research".
Yes!
I downloaded some tracks from certain website. Those tracks
could not be played in my portable player, where as it can be played
in my PC where it was originally downloaded.

Thanks to Darude anyway!
I visited that website as well, and learned something new,but nothing connected with what I am looking for.

Thanks once again to pothole.
Cheers mate!