Batchography: Detect Windows Language

To detect the Windows Operating system language, it is enough to query the registry. We use the “reg query” command and then parse the output.

@echo off

setlocal

:: https://docs.microsoft.com/en-us/previous-versions/office/developer/speech-technologies/hh361638(v=office.14)

for /F "usebackq tokens=3" %%a IN (`reg query "hklm\system\controlset001\control\nls\language" /v Installlanguage`) DO (
  set lang_id=%%a
)
:: 0409 English ; 0407 German ; 040C French ; 0C0A Spanish

if "%lang_id%"=="0409" (
  echo English detected
) else if "%lang_id%" == "040C" (
  echo French detected
) else (
  echo Note: Unknown language ID %lang_id%!
)

echo LangID=%lang_id%

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