Media Foundation Codecs 2026-09-12

When Windows shows "This item was encoded in a format that's not supported" and refuses to play a video, the decoder for that format is missing from the system.

Media Foundation Codecs gathers the official Microsoft extensions that put those decoders back, in one download.

Every part of it is free, and you only install the pieces you actually need.

What Media Foundation Codecs Actually Is

Media Foundation is the part of Windows that decodes video and audio for the apps built on it, including the Media Player app, Movies & TV and Photos. Our guide on how Media Foundation works covers it in more depth.

Windows does not carry a decoder for every format. Microsoft publishes the missing ones as separate free extensions, and this pack collects them so you are not hunting them down one at a time.

Nothing here is a third-party codec. Each package is Microsoft's own, apart from the Dolby one, which comes from Dolby Laboratories.

What Is In the Pack

Ten extensions, covering video, images and Dolby audio. The right-hand column is the one to read first.

The HEVC one is the reason most people land here. Microsoft charges for it in the Store, while the identical HEVC Video Extensions from Device Manufacturer package is free, and our guide explains how to get HEVC free.

One reader asked for JPEG XL back in 2025. It is in the pack now, and Microsoft still publishes it for Windows 11 only.

The Errors These Actually Fix

Error 0xc00d5212 in Movies & TV is the common one, and it almost always means HEVC or MPEG-2 is missing.

A file that plays sound with a black picture is a missing video decoder. A file that shows a picture with no sound is usually the Dolby one, because Windows 11 24H2 dropped the built-in Dolby Digital decoder.

In File Explorer, photos that show a generic icon instead of a thumbnail are the image extensions talking, not the video ones.

If you are not sure which decoder a file needs, our free Codec Finder reads the file in your browser and tells you, without uploading it anywhere. For a stubborn playback fault, the Codec Troubleshooter walks through the usual causes.

What This Pack Does Not Fix

These extensions plug into Media Foundation, so they reach the apps built on it and nothing else. Older DirectShow players, Windows Media Player Legacy included, do not see them at all.

For those, install LAV Filters or the K-Lite Codec Pack instead, which supply decoders the old way.

Windows N and KN editions are a separate problem. They ship without Media Foundation itself, so the fix is Microsoft's Media Feature Pack, added from Settings under Optional features, before any of these extensions can do anything.

Protected files are the other dead end. A purchased film or a DRM-locked download will not open for any codec, because the block is a licence rather than a missing decoder.

Check What You Already Have

These arrive as Microsoft Store apps, so they appear in your normal app list. On Windows 11, open Settings, then Apps, then Installed apps, and search for "extension".

On Windows 10 the same list is under Settings, then Apps, then Apps and features.

Windows 11 usually ships with several of them already, commonly VP9, WebP and HEIF, so check before you install anything. If a cleanup tool such as Win11Debloat stripped the Store from the machine, this pack is how you get them back without it.

Installing It

The download is an archive. Extract it, then open only the extensions you need from the table above, and Windows installs each one through its own App Installer.

There are two archives on the download page. The main one carries the Microsoft extensions, and the separate Dolby Laboratories archive carries the Dolby audio decoder.

Windows 10 users need version 1709 or newer. JPEG XL is the one exception in the pack, because Microsoft publishes it for Windows 11 only.

Windows will not install an older version over a newer one. If a package is refused, you already have a newer copy and there is nothing to do.

Who Should Look Elsewhere

The tell is which player you open your files in. If you already use VLC media player or MPC-BE, you do not need any of this for playback, because both carry their own decoders.

What those players cannot do is give File Explorer thumbnails or let the Media Player app and Photos open the same files. That is the gap these extensions fill.

If HEIC photos are your only problem and you would rather skip the Store entirely, WIC for HEIC does that one job on its own.

And if HEVC video is still refusing to play after all this, our HEVC troubleshooting guide works through the remaining causes.

Quick questions

Download Media Foundation Codecs and see which of your files open afterwards, or tell us how you got on if you have used it before.