May it helps those who needed.   #include <WinAPI.au3> ; #FUNCTION# ==================================================================================================================== ; Name ..........: _IsUEFIBoot ; Description ...: Detemine the Current OS is boot in UEFI mode or not ; Syntax ........: _IsUEFIBoot() ; Parameters ....: ; Return values .: True:OS is boot in UEFI ; False: OS is boot in Legacy BIOS