Search query format to get better results in google

Do you often search for files in Google? Do you always have a tough luck searching for files? If yes then read on this post.
Just try the following query format to search any file in Google .

?intitle:index.of? <file name> <file extension>

I tried to search Bob Sinclair's World Hold On (Children of the sky) with the following search query
?intitle:index.of? world hold on .mp3 and I got the result in the first page itself.