search a directory and all subdirectory for a file in windows

I am writing a program for a windows PC and need part of the program to search a directory and all
sub directories. I've tried FindFirstfile and FindNextFile but they just search the currect directory and the "PATH". I need to search the complete directory. Is there a function to do this?

Thanks:)

wrong forum, there is a windows specific forum this thread will probably be moved

Thanks for the information what I was looking for is on the other board.. :)