Format of the WinRun control block (WCB):
Offset	Size	Description	)
 00h	DWORD	pointer to ASCIZ command string
 04h	WORD	(ret) WinRun receiver status
		0000h-001Fh WinExec() error
		0020h-FFFEh WinExec() instance handle
		FFFFh	    Windows not running or WinRun receiver not
				  installed