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I got two simple question for you guys today, hopefully you can help me since I haven't been able to find it myself for some reason.

For Windows 10 1809 what registry keys controls the following settings?:

  • Settings > Time & Language > Region > "Country or region"
  • Settings > Time & Language > Language > "Preferred language" order of languages

I've tested quite a bit with the following keys, but they do not seem to control any of these five settings:

HKLM\SYSTEM\CurrentControlSet\Control\Nls\Locale > "(Default)" key
HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language > "Default" key
HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language > "InstallLanguage" key HKCU\Control Panel\International\Geo > "Nation" key
HKCU\Control Panel\International > "Locale" key
HKCU\Control Panel\International > "LocaleName" key

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That is five settings.

HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language!Default is set by Regional Control Panel, Administrative tab, Language for non-Unicode Programs.

HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language!(Default) is set by Regional Control Panel, Administrative tab, Language for non-Unicode Programs. (There can be multiple values for this).

HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language!InstallLanguage is set by Windows setup and used by the Windows upgrade process.

HKCU\Control Panel\International!Locale and LocaleName are set by Regional Control Panel, Formats, Format.

HKCU\Control Panel\International\Geo!Nation is set by Regional Control Panel, Location, Home Location.


Windows 10 1809:

Settings > Time & Language > Region > "Country or region"

Updates:

HKCU\Control Panel\International\Geo!Name
HKCU\Control Panel\International\Geo!Nation

Settings > Time & Language > Language > "Preferred language"

Does not update any one registry key/value. Sample:

HKCU\Software\Microsoft\CTF\SortOrder\Language\00000000
HKCU\Software\Microsoft\CTF\SortOrder\Language\00000001
HKCU\Software\Microsoft\CTF\SortOrder\Language\00000002

HKCU\Control Panel\International\User Profile\[langid]\CachedLanguageName

HKCU\Software\Microsoft\Internet Explorer\International\AcceptLanguage

HKCU\Keyboard Layout\Substitutes\[langid]

HKCU\Keyboard Layout\Preload\2

So if you're trying to determine what registry settings, you may have your work cut out for you.

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