searching for a file containing…in W7

*.h content:”string.h”

Search for a file of type .h containing the phrase string.h

and if that isn’t enough excitment try looking intoIfiltersI’ve never tried it but it looks plausible.

…and also there is this site for advanced searching
…or what about the command line command findstr
…or install cygwin and follow this useful article on lifehacker