Prevent Codec Download: registry value PreventCodecDownloadUserHKCU\Software\Policies\Microsoft\WindowsMediaPlayer

Policy ID: PolicyCodecUpdate
Scope: User Configuration
Supported on: Windows Media Player for Windows XP and later.
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Windows Media Player › Playback

Registry

PreventCodecDownload

REG_DWORDUser

HKCU\Software\Policies\Microsoft\WindowsMediaPlayer Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\WindowsMediaPlayer]

; Options (use only one)
; Enabled
"PreventCodecDownload"=dword:00000001
; Disabled
"PreventCodecDownload"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKCU\Software\Policies\Microsoft\WindowsMediaPlayer" /v "PreventCodecDownload" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKCU\Software\Policies\Microsoft\WindowsMediaPlayer" /v "PreventCodecDownload" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\Software\Policies\Microsoft\WindowsMediaPlayer' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\WindowsMediaPlayer' -Name 'PreventCodecDownload' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\WindowsMediaPlayer' -Name 'PreventCodecDownload' -PropertyType DWord -Value 0 -Force | Out-Null