Ever wondered which program has a particular file or directory open? Now you can find out. Process Explorer shows information about which handles and DLLs processes have opened or loaded. Process Explorer display consists of two sub-windows. The top window always shows a list of currently active processes, including account names they have, whereas the information displayed in the bottom window depends on the mode that Process Explorer is in: if it is in handle mode you'll see the handles that the process selected in the window above has opened, if Process Explorer is in DLL mode you'll see the DLLs and memory-mapped files that the process has loaded. Process Explorer also has a powerful search capability that will quickly show you which processes have particular handles opened or DLLs loaded. This unique capability Process Explorer make it useful for tracking down DLL-version problems or handle leaks, and provide insight into the way Windows and applications work .