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Description:  

Adds and deletes specified Web content items.

You can use the "Add" box in this setting to add particular Web-based items or shortcuts to users' desktops.
Users can close or delete the items (if settings allow), but the items are added again each time the setting is
refreshed.

You can also use this setting to delete particular Web-based items from users' desktops. Users can add the
item again (if settings allow), but the item is deleted each time the setting is refreshed.

Note: Removing an item from the "Add" list for this setting is not the same as deleting it. Items that are
removed from the "Add" list are not removed from the desktop. They are simply not added again.

Note: For this setting to take affect, you must log off and log on to the system.

Supported on: Windows Server 2003, Windows XP, and Windows 2000 operating systems only.
Add/Delete items
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 ->
Desktop -> Desktop and open Add/Delete items.
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\Microsoft\Windows\CurrentVersion\Policies
\ActiveDesktop\AdminComponent
and locate Add 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 Add and edit the value:

To Enable:
Change the data value with:
Add = "example1"
Delete = "example2"

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\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent" /v Add /t REG_SZ /d "example1" /f
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent" /v Delete /t REG_SZ /d "example2" /f

Not Configured:
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent" /v Add /f
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent" /v Delete /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\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName1 = "Add"
strValueName2 = "Delete"
'Enabled
strValue1 = "example1"
strValue2 = "example2"
oReg.SetStringValue HKEY_CURRENT_USER,strKeyPath,strValueName1,strValue1
oReg.SetStringValue HKEY_CURRENT_USER,strKeyPath,strValueName2,strValue2
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName1
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName2
   
PowerShell Script :          

Enabled

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
If(Test-Path ($RegKey + "\ActiveDesktop"))
{
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop"
 If(Test-Path ($RegKey + "\AdminComponent"))
 {
   ##Enabled
    New-ItemProperty -path $RegKey -name Add -value "example1" -PropertyType String -Force
    New-ItemProperty -path $RegKey -name Delete -value "example2" -PropertyType String -Force
 }
 else
 {
   New-Item -path $RegKey -name AdminComponent
   $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent"
   ##Enabled
    New-ItemProperty -path $RegKey -name Add -value "example1" -PropertyType String
    New-ItemProperty -path $RegKey -name Delete -value "example2" -PropertyType String
 }
}
else
{
 New-Item -path $RegKey -name ActiveDesktop
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop"
 New-Item -path $RegKey -name AdminComponent
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\AdminComponent"
  ##Enabled
  New-ItemProperty -path $RegKey -name Add -value "example1" -PropertyType String
  New-ItemProperty -path $RegKey -name Delete -value "example2" -PropertyType String
}

Not Configured\Disabled

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
Remove-ItemProperty -Path($RegKey + "\ActiveDesktop\AdminComponent") -name Add
Remove-ItemProperty -Path($RegKey + "\ActiveDesktop\AdminComponent") -name Delete
If( (Get-Item -Path($RegKey + "\ActiveDesktop\AdminComponent")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\ActiveDesktop\AdminComponent")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\ActiveDesktop\AdminComponent")
 If( (Get-Item -Path($RegKey + "\ActiveDesktop")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\ActiveDesktop")).SubKeyCount -eq 0)
 {
   Remove-Item -Path($RegKey + "\ActiveDesktop")
 } 
}
   
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Result:

Need test pictures.
Verify code.
Result