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So there was a topic on the General Help and Support board where the poster mentioned it was not easy to check if the system was installed with UEFI or legacy mode and it got me looking down a rabbit hole. Apparently you can't just whip up a simple WMI query to find that out. But I did find that you can read the output of bcdedit.exe to check if the system is using winload.efi or winload.exe, so then I got stuck because bcdedit doesn't play nice with StdoutRead. Finally I discovered that toggling Wow64DisableWow64FsRedirection would make it all work together. I hope this helps someone. Maybe it can be simplified, I'm no expert. 🤨 DllCall("kernel32.dll", "int", "Wow64DisableWow64FsRedirection", "int", 1) $aArray = StringSplit(_getDOSOutput("bcdedit.exe"), @CRLF) DllCall("kernel32.dll", "int", "Wow64DisableWow64FsRedirection", "int", 0) For $i = 1 To UBound($aArray) - 1 Select Case StringInStr($aArray[$i], 'Windows Boot Loader') And StringInStr($aArray[$i + 3], 'device partition=C:') And StringInStr($aArray[$i + 4], 'winload.efi') ConsoleWrite("UEFI mode" & @CRLF) Case StringInStr($aArray[$i], 'Windows Boot Loader') And StringInStr($aArray[$i + 3], 'device partition=C:') And StringInStr($aArray[$i + 4], 'winload.exe') ConsoleWrite("Legacy BIOS" & @CRLF) EndSelect Next Func _getDOSOutput($command, $wd = '') ; https://www.autoitscript.com/forum/topic/190249-get-result-of-shellexecute/ Local $text = '', $Pid = Run('"' & @ComSpec & '" /c ' & $command, $wd, @SW_HIDE, 2 + 4) While 1 $text &= StdoutRead($Pid, False, False) If @error Then ExitLoop Sleep(10) WEnd Return StringStripWS($text, 7) EndFunc ;==>_getDOSOutput

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 ; Author ........: czyt ; Modified ......: ; Remarks .......: ; Related .......: http://techsupt.winbatch.com/webcgi/webbatch.exe?techsupt/nftechsupt.web+WinBatch/DllCall~Information+Booted~UEFI~or~BIOS.txt ; Link ..........: ; Example .......: MsgBox(0,'(*^__^*) The OS is in UEFI Boot mode?',_IsUEFIBoot()) ; =============================================================================================================================== #include <WinAPI.au3> Func _IsUEFIBoot() Local Const $ERROR_INVALID_FUNCTION = 0x1 Local $hDLL = DllOpen("Kernel32.dll") If @OSBuild > 8000 Then Local $aCall = DllCall($hDLL, "int", "GetFirmwareType", "int*", 0) DllClose($hDLL) If Not @error And $aCall[0] Then Switch $aCall[1] ; 1 - bios 2- uefi 3-unknown Case 2 Return True Case Else Return False EndSwitch EndIf Return False Else DllCall($hDLL, "dword", "GetFirmwareEnvironmentVariableW", "wstr", "", "wstr", '{00000000-0000-0000-0000-000000000000}', "wstr", Null, "dword", 0) DllClose($hDLL) If _WinAPI_GetLastError() = $ERROR_INVALID_FUNCTION Then Return False Else Return True EndIf EndIf EndFunc ;==>IsUEFIBoot updated at 2021-08-13: fixed check err on windows 8 above OS

I've been getting reports from manufacturing that some of our applications have been generating an error, such as: AUTOIT ERROR LINE 1165(X:\windows\system32\program.exe) ERROR: Subscript used w/ non-array variable