#This function finds any AppX/AppXProvisioned package and uninstalls it, except for Freshpaint, Windows Calculator, Windows Store, and Windows Photos.
#Also, to note - This does NOT remove essential system services/software/etc such as .NET framework installations, Cortana, Edge, etc.

#This is the switch parameter for running this script as a 'silent' script, for use in MDT images or any type of mass deployment without user interaction.
param ([switch]$Debloat)

param ([switch]$SysPrep)

param ([switch]$StopEdgePDF)

#This will run get-appxpackage | remove-appxpackage which is required for sysprep to provision the apps.
function Begin-SysPrep {

  param ([switch]$SysPrep)

  Get-AppxPackage | Remove-AppxPackage -ErrorAction SilentlyContinue

}

#Creates a PSDrive to be able to access the 'HKCR' tree
New-PSDrive -Name HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT
function Start-Debloat {

  param ([switch]$Debloat)

  #Removes AppxPackages
  #Credit to Reddit user /u/GavinEke for a modified version of my whitelist code
  [regex]$WhitelistedApps = 'Microsoft.Paint3D|Microsoft.WindowsCalculator|Microsoft.WindowsStore|Microsoft.Windows.Photos'
  Get-AppxPackage -AllUsers | Where-Object { $_.Name -notmatch $WhitelistedApps } | Remove-AppxPackage -ErrorAction SilentlyContinue
  Get-AppxProvisionedPackage -Online | Where-Object { $_.PackageName -notmatch $WhitelistedApps } | Remove-AppxProvisionedPackage -Online -ErrorAction SilentlyContinue
}

function Remove-Keys {

  param ([switch]$Debloat)

  #These are the registry keys that it will delete.

  $Keys = @(

    #Remove Background Tasks
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\46928bounde.EclipseManager_2.2.4.51_neutral__a5h4egax66k6y"
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\ActiproSoftwareLLC.562882FEEB491_2.6.18.18_neutral__24pqs290vpjk0"
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\Microsoft.MicrosoftOfficeHub_17.7909.7600.0_x64__8wekyb3d8bbwe"
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\Microsoft.PPIProjection_10.0.15063.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\Microsoft.XboxGameCallableUI_1000.15063.0.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.BackgroundTasks\PackageId\Microsoft.XboxGameCallableUI_1000.16299.15.0_neutral_neutral_cw5n1h2txyewy"

    #Windows File
    "HKCR:\Extensions\ContractId\Windows.File\PackageId\ActiproSoftwareLLC.562882FEEB491_2.6.18.18_neutral__24pqs290vpjk0"

    #Registry keys to delete if they aren't uninstalled by RemoveAppXPackage/RemoveAppXProvisionedPackage
    "HKCR:\Extensions\ContractId\Windows.Launch\PackageId\46928bounde.EclipseManager_2.2.4.51_neutral__a5h4egax66k6y"
    "HKCR:\Extensions\ContractId\Windows.Launch\PackageId\ActiproSoftwareLLC.562882FEEB491_2.6.18.18_neutral__24pqs290vpjk0"
    "HKCR:\Extensions\ContractId\Windows.Launch\PackageId\Microsoft.PPIProjection_10.0.15063.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.Launch\PackageId\Microsoft.XboxGameCallableUI_1000.15063.0.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.Launch\PackageId\Microsoft.XboxGameCallableUI_1000.16299.15.0_neutral_neutral_cw5n1h2txyewy"

    #Scheduled Tasks to delete
    "HKCR:\Extensions\ContractId\Windows.PreInstalledConfigTask\PackageId\Microsoft.MicrosoftOfficeHub_17.7909.7600.0_x64__8wekyb3d8bbwe"

    #Windows Protocol Keys
    "HKCR:\Extensions\ContractId\Windows.Protocol\PackageId\ActiproSoftwareLLC.562882FEEB491_2.6.18.18_neutral__24pqs290vpjk0"
    "HKCR:\Extensions\ContractId\Windows.Protocol\PackageId\Microsoft.PPIProjection_10.0.15063.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.Protocol\PackageId\Microsoft.XboxGameCallableUI_1000.15063.0.0_neutral_neutral_cw5n1h2txyewy"
    "HKCR:\Extensions\ContractId\Windows.Protocol\PackageId\Microsoft.XboxGameCallableUI_1000.16299.15.0_neutral_neutral_cw5n1h2txyewy"

    #Windows Share Target
    "HKCR:\Extensions\ContractId\Windows.ShareTarget\PackageId\ActiproSoftwareLLC.562882FEEB491_2.6.18.18_neutral__24pqs290vpjk0"
  )

  #This writes the output of each key it is removing and also removes the keys listed above.
  foreach ($Key in $Keys) {
    Write-Output "Removing $Key from registry"
    Remove-Item $Key -Recurse -ErrorAction SilentlyContinue
  }
}

function Protect-Privacy {

  param ([switch]$Debloat)

  #Creates a PSDrive to be able to access the 'HKCR' tree
  New-PSDrive -Name HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT

  #Disables Windows Feedback Experience
  Write-Output "Disabling Windows Feedback Experience program"
  $Advertising = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AdvertisingInfo'
  if (Test-Path $Advertising) {
    Set-ItemProperty $Advertising -Name Enabled -Value 0 -Verbose
  }

  #Stops Cortana from being used as part of your Windows Search Function
  Write-Output "Stopping Cortana from being used as part of your Windows Search Function"
  $Search = 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search'
  if (Test-Path $Search) {
    Set-ItemProperty $Search -Name AllowCortana -Value 0 -Verbose
  }

  #Stops the Windows Feedback Experience from sending anonymous data
  Write-Output "Stopping the Windows Feedback Experience program"
  $Period1 = 'HKCU:\Software\Microsoft\Siuf'
  $Period2 = 'HKCU:\Software\Microsoft\Siuf\Rules'
  $Period3 = 'HKCU:\Software\Microsoft\Siuf\Rules\PeriodInNanoSeconds'
  if (!(Test-Path $Period3)) {
    mkdir $Period1 -ErrorAction SilentlyContinue
    mkdir $Period2 -ErrorAction SilentlyContinue
    mkdir $Period3 -ErrorAction SilentlyContinue
    New-ItemProperty $Period3 -Name PeriodInNanoSeconds -Value 0 -Verbose -ErrorAction SilentlyContinue
  }

  Write-Output "Adding Registry key to prevent bloatware apps from returning"
  #Prevents bloatware applications from returning
  $registryPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\CloudContent"
  if (!(Test-Path $registryPath)) {
    mkdir $registryPath -ErrorAction SilentlyContinue
    New-ItemProperty $registryPath -Name DisableWindowsConsumerFeatures -Value 1 -Verbose -ErrorAction SilentlyContinue
  }

  Write-Output "Setting Mixed Reality Portal value to 0 so that you can uninstall it in Settings"
  $Holo = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Holographic'
  if (Test-Path $Holo) {
    Set-ItemProperty $Holo -Name FirstRunSucceeded -Value 0 -Verbose
  }

  #Disables live tiles
  Write-Output "Disabling live tiles"
  $Live = 'HKCU:\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\PushNotifications'
  if (!(Test-Path $Live)) {
    mkdir $Live -ErrorAction SilentlyContinue
    New-ItemProperty $Live -Name NoTileApplicationNotification -Value 1 -Verbose
  }

  #Turns off Data Collection via the AllowTelemtry key by changing it to 0
  Write-Output "Turning off Data Collection"
  $DataCollection = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\DataCollection'
  if (Test-Path $DataCollection) {
    Set-ItemProperty $DataCollection -Name AllowTelemetry -Value 0 -Verbose
  }

  #Disables People icon on Taskbar
  Write-Output "Disabling People icon on Taskbar"
  $People = 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\People'
  if (!(Test-Path $People)) {
    mkdir $People -ErrorAction SilentlyContinue
    New-ItemProperty $People -Name PeopleBand -Value 0 -Verbose
  }

  #Disables suggestions on start menu
  Write-Output "Disabling suggestions on the Start Menu"
  $Suggestions = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager'
  if (Test-Path $Suggestions) {
    Set-ItemProperty $Suggestions -Name SystemPaneSuggestionsEnabled -Value 0 -Verbose
  }

  #Loads the registry keys/values below into the NTUSER.DAT file which prevents the apps from redownloading. Credit to a60wattfish
  reg load HKU\Default_User C:\Users\Default\NTUSER.DAT
  Set-ItemProperty -Path Registry::HKU\Default_User\SOFTWARE\Microsoft\Windows\CurrentVersion\ContentDeliveryManager -Name SystemPaneSuggestionsEnabled -Value 0
  Set-ItemProperty -Path Registry::HKU\Default_User\SOFTWARE\Microsoft\Windows\CurrentVersion\ContentDeliveryManager -Name PreInstalledAppsEnabled -Value 0
  Set-ItemProperty -Path Registry::HKU\Default_User\SOFTWARE\Microsoft\Windows\CurrentVersion\ContentDeliveryManager -Name OemPreInstalledAppsEnabled -Value 0
  reg unload HKU\Default_User

  #Disables scheduled tasks that are considered unnecessary
  Write-Output "Disabling scheduled tasks"
  Get-ScheduledTask -TaskName XblGameSaveTaskLogon | Disable-ScheduledTask
  Get-ScheduledTask -TaskName XblGameSaveTask | Disable-ScheduledTask
  Get-ScheduledTask -TaskName Consolidator | Disable-ScheduledTask
  Get-ScheduledTask -TaskName UsbCeip | Disable-ScheduledTask
  Get-ScheduledTask -TaskName DmClient | Disable-ScheduledTask
  Get-ScheduledTask -TaskName DmClientOnScenarioDownload | Disable-ScheduledTask
}

function Stop-EdgePDF {

  param ([switch]$StopEdgePDF)

  #Stops edge from taking over as the default .PDF viewer
  Write-Output "Stopping Edge from taking over as the default .PDF viewer"
  $NoOpen = 'HKCR:\.pdf'
  if (!(Get-ItemProperty $NoOpen -Name NoOpenWith)) {
    New-ItemProperty $NoOpen -Name NoOpenWith -Verbose -ErrorAction SilentlyContinue
  }

  $NoStatic = 'HKCR:\.pdf'
  if (!(Get-ItemProperty $NoStatic -Name NoStaticDefaultVerb)) {
    New-ItemProperty $NoStatic -Name NoStaticDefaultVerb -Verbose -ErrorAction SilentlyContinue
  }

  $NoOpen = 'HKCR:\.pdf\OpenWithProgids'
  if (!(Get-ItemProperty $NoOpen -Name NoOpenWith)) {
    New-ItemProperty $NoOpen -Name NoOpenWith -Verbose -ErrorAction SilentlyContinue
  }

  $NoStatic = 'HKCR:\.pdf\OpenWithProgids'
  if (!(Get-ItemProperty $NoStatic -Name NoStaticDefaultVerb)) {
    New-ItemProperty $NoStatic -Name NoStaticDefaultVerb -Verbose -ErrorAction SilentlyContinue
  }

  $NoOpen = 'HKCR:\.pdf\OpenWithList'
  if (!(Get-ItemProperty $NoOpen -Name NoOpenWith)) {
    New-ItemProperty $NoOpen -Name NoOpenWith -Verbose -ErrorAction SilentlyContinue
  }

  $NoStatic = 'HKCR:\.pdf\OpenWithList'
  if (!(Get-ItemProperty $NoStatic -Name NoStaticDefaultVerb)) {
    New-ItemProperty $NoStatic -Name NoStaticDefaultVerb -Verbose -ErrorAction SilentlyContinue
  }

  #Appends an underscore '_' to the Registry key for Edge
  $Edge = 'HKCR:\AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723'
  if (Test-Path $Edge) {
    Set-Item $Edge AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723_ -Verbose
  }
}

function FixWhitelistedApps {

  param ([switch]$Debloat)

  if (!(Get-AppxPackage -AllUsers | Select-Object Microsoft.Paint3D,Microsoft.WindowsCalculator,Microsoft.WindowsStore,Microsoft.Windows.Photos)) {

    #Credit to abulgatz for the 4 lines of code
    Get-AppxPackage -AllUsers Microsoft.Paint3D | ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }
    Get-AppxPackage -AllUsers Microsoft.WindowsCalculator | ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }
    Get-AppxPackage -AllUsers Microsoft.WindowsStore | ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }
    Get-AppxPackage -AllUsers Microsoft.Windows.Photos | ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }
  }
}

Write-Output "Initiating Sysprep"
Begin-SysPrep
Write-Output "Removing bloatware apps."
Start-Debloat
Write-Output "Removing leftover bloatware registry keys."
Remove-Keys
Write-Output "Checking to see if any Whitelisted Apps were removed, and if so re-adding them."
Write-Output "Stopping telemetry, disabling unneccessary scheduled tasks, and preventing bloatware from returning."
Protect-Privacy
Write-Output "Stopping Edge from taking over as the default PDF Viewer."
Stop-EdgePDF
Write-Output "Finished all tasks."