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Description:  

Specifies which theme file is applied to the computer the first time a user logs on.

If you enable this setting, the theme that you specify will be applied when a new user logs on for the first
time.  This policy does not prevent the user from changing the theme or any of the theme elements such as
the desktop background, window color, sounds, or screen saver after the first logon.

If you disable or do not configure this setting, the default theme will be applied at the first logon.

Supported on: At least Windows 7 or Windows Server 2008 R2.
Load a specific theme
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to User Configuration -> Administrative Templates ->
Control Panel -> Personalization and open Load a specific theme.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable. The GPO Default state is Not
Configured -> this registry entry is not present. For Disable this registry entry is not present.

Please navigate to HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Personalization
and locate ThemeFile registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
   
Double click on ThemeFile and edit the value:

To Enable:
Change the data value with:
ThemeFile = C:\Windows\Resources\Themes\scenes.theme

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKCU\Software\Policies\Microsoft\Windows\Personalization" /v ThemeFile /t REG_SZ /d C:\Windows\Resources\Themes\scenes.theme /f

Not Configured:
REG DELETE "HKCU\Software\Policies\Microsoft\Windows\Personalization" /v ThemeFile /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
VBScript:          

Const HKEY_CURRENT_USER = &H80000001
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "Software\Policies\Microsoft\Windows\Personalization"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName = "ThemeFile"
'Enabled
strValue = "C:\Windows\Resources\Themes\scenes.theme"
oReg.SetStringValue HKEY_CURRENT_USER,strKeyPath,strValueName,strValue
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName
PowerShell Script :          

Enabled

$RegKey = "HKCU:\Software\Policies\Microsoft\Windows"
If(Test-Path ($RegKey + "\Personalization"))
{
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Personalization"
  ##Enabled
  New-ItemProperty -path $RegKey -name ThemeFile -value C:\Windows\Resources\Themes\scenes.theme -PropertyType String -Force
}
else
{
 New-Item -path $RegKey -name Personalization
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Personalization"
  ##Enabled
  New-ItemProperty -path $RegKey -name ThemeFile -value C:\Windows\Resources\Themes\scenes.theme -PropertyType String
}

Not Configured\Disabled

$RegKey = "HKCU:\Software\Policies\Microsoft\Windows"
Remove-ItemProperty -Path($RegKey + "\Personalization") -name ThemeFile
If( (Get-Item -Path($RegKey + "\Personalization")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Personalization")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\Personalization")   
}
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Result
Need test pictures