On XP and 2K+3

   GetWindowThreadProcessId() will map a window handle to a process
identifier.

   OpenProcess() will map a process id to a process handle.

   GetProcessImageFileName() will map the handle to the path.

On any platform:

   GetWindowThreadProcessId() yields a process id as above

   CreateToolhelp32Snapshot() gets a list of processes

   Process32First() and Process32Next() walks the list - you want the one
whose id matches.

Don't forget to clean up - close whatever handles you open.

Also note that the data you get can go stale - that is the window can be
closed or the process can exit as you are gathering the data.

Regards,
Will

There's also the GetWindowModuleFileName API.

Mattias