Working with directories in windows

I'm writing a program for windows xp, and basically the user inputs a file name, and the the programs does stuff to that file.

I'm wondering if its possible to give the user the option of inputing a directory path, and then have the program do stuff to every file in that directory and all sub directories.

Thanks

Yes, of course it's possible, although not from standard C alone. Check MSDN for file-specific Windows API functions.