Determines if an existing folder contains the attributes that make it a system folder
#include <WinAPIShPath.au3>
_WinAPI_PathIsSystemFolder ( $sFilePath )
| $sFilePath | The name of an existing folder to check the system folder attributes. | 
| True: | the path is a system folder. | 
| False: | the path is not a system folder. | 
Search PathIsSystemFolder in MSDN Library.