= Windows/BackgroundWallpaper =
 * 2021 - Win10 - Wallpaper in registry, regedit {{{
Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Wallpapers
}}}
    * remove BackgroundHistoryPathX to get back windows wallpaper as option.


 * Images in ```c:\Windows\Web\4K\Wallpaper\Windows\``` , ```c:\Windows\Web\Wallpaper\Windows\img0.jpg```
== AWS Wallpaper ==
 * 20 sec after loggin in a user's wallpaper gets updated with server information.
   1. Find user with {{{
Get-WMIObject -Query "select * from Win32_UserAccount where Name='<username>'"
}}}
   2. Reggedit Using the user key e.g. {{{
Computer\HKEY_USERS\<S-1-5-...62>\Software\Microsoft\Windows\CurrentVersion\Explorer\Wallpapers
}}}
   3. This should show the previous and current wall paper e.g. {{{
BackgroundHistoryPath0  C:\Users\<username>\AppData\Local\Ec2Wallpaper_Info.jpg
BackgroundHistoryPath1  C:\Windows\web\wallpaper\Windows\img0.jpg
}}}
== AWS Ec2LaunchSettings ==
 * ```c:\ProgramData\Amazon\EC2-Windows\Launch\Module\Ec2Launch.psm1```
   * this runs all the scripts under EC2-Windows\Launch\Scripts\*.ps1

 * Start > run > !Ec2LaunchSettings
   * {{{ C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeInstance.ps1 }}}
     * {{{ Wait-Metadata }}}
     * {{{ New-WallpaperSetup }}}
 * {{{ New-WallpaperSetup.ps1 }}} - in - {{{ c:\ProgramData\Amazon\EC2-Windows\Launch\Module\Scripts\ }}}
   * Create startup dirs for  default and all users e.g. "C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup"
     * then create "initWallpaperSetupName" as startup script. {{{
#Powershell
"Import-Module "C:\ProgramData\Amazon\EC2-Windows\Launch\Module\Ec2Launch.psd1"; Set-Wallpaper"
# This run's all the ec2 scripts\*.ps1 modules, including "Set-Wallpaper.ps1"
}}}

 * "Set-Wallpaper.ps1"
   * Impost-WallpaperUtil
   * Logs to "WallpaperSetup.log" -> C:\ProgramData\Amazon\EC2-Windows\Launch\Log\



== Set for user ==
 * https://stackoverflow.com/questions/43187787/change-wallpaper-powershell {{{
 reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d h:\Quotefancy-1542-3840x2160.jpg /f
 Start-Sleep -s 10
 rundll32.exe user32.dll, UpdatePerUserSystemParameters, 0, $false
}}}
   
* https://superuser.com/questions/430508/how-to-change-desktop-background-of-a-specific-user-in-a-batch-file {{{
#PowerShell:
$user = Get-WMIObject -Query "select * from Win32_UserAccount where Name='<username>'"
$path = 'Registry::HKEY_USERS\' + $user.SID + '\Control Panel\Desktop\'
Set-ItemProperty -path $path -name Wallpaper -value 'C:\path\to\wallpaper.jpg'
rundll32.exe user32.dll UpdatePerUserSystemParameters
}}}