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Sometimes it is required to set the UI language of the session to a special language for a specific user or app.

For this you have to follow these steps:

1. Install the required language(s) in Windows:
   Hint: Don't download more than one language at the time, otherwise Windows update sometimes stuck
   
   
2. Create a StartupBefore.ps1 file in c:\ProgramData\Cameyo with the following content (or add it to your existing, if any):
   

   Add-Type @"
   using System;
   using System.Runtime.InteropServices;
   
   
   public class User32
   {
       [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
       public static extern int SendMessageTimeout(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam, SendMessageTimeoutFlags fuFlags, uint uTimeout, out IntPtr lpdwResult);
   
   
       public const uint WM_SETTINGCHANGE = 0x001A;
       
       [Flags]
       public enum SendMessageTimeoutFlags : uint
       {
           SMTO_NORMAL = 0x0000,
           SMTO_BLOCK = 0x0001,
           SMTO_ABORTIFHUNG = 0x0002,
           SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
       }
   
   
       public static void RefreshSettings()
       {
           IntPtr result;
           SendMessageTimeout(IntPtr.Zero, WM_SETTINGCHANGE, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 100, out result);
       }
   }
   "@
   
   
   if ($env:CAMEYO_UILANGUAGE -ne $null) {
       $language = $env:CAMEYO_UILANGUAGE
       
       Set-ItemProperty -Path 'HKCU:\Control Panel\Desktop' -Name 'PreferredUILanguages' -Value $language
       Set-ItemProperty -Path 'HKCU:\Control Panel\International' -Name 'LocaleName' -Value $language
       Set-ItemProperty -Path 'HKCU:\Control Panel\International\User Profile' -Name 'Languages' -Value $language
       [User32]::RefreshSettings()
   }
   
   

   
   
   
3. Get the language code(s) [LanguageTag] with the following PowerShell command:

   Get-WinUserLanguageList

   
   
   
4. Set the following PowerTag on the user/app/...

   !UILANGUAGE=sv-SE

   
   
   
5. You will see the software in the UI language (if the software supports it!)