mfplat.dll is missing or crashes a program: what the file is and how to fix it

Each file below is Microsoft's own mfplat.dll for one Windows release, fetched from Microsoft's own server and checked against Winbindex, the index of the files in Windows images and updates. Pick your Windows version (Settings, System, About shows it) and the build: 64-bit for System32, 32-bit for SysWOW64. On an N edition a single file is not the fix, because Media Foundation needs its other parts too: add the Media Feature Pack instead. Use a file here to compare it with a copy you have, or when System File Checker and DISM cannot repair the file on a full edition.

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The wording tells you which problem you have. These are the texts Windows and programs show, as written, with the file name filled in.

mfplat.dll is the core of Media Foundation, the Windows platform for audio and video. Programs load it to open media files and streams, decode and encode video, use the graphics card for playback, and capture from cameras and microphones. Games that play video cutscenes, streaming and recording tools, video editors and the Windows media apps all depend on it. What Windows reports for the genuine file:

On 64-bit Windows, System32 holds the 64-bit file and SysWOW64 the 32-bit one; the folder names are historical. Both are present on every full edition, and both are missing on an N or KN edition until the Media Feature Pack is added. The genuine file describes itself as Media Foundation Platform DLL (Properties, Details, File description) and is about 2 MB: in Windows 11 24H2 and 25H2 the 64-bit file is 2,304,128 bytes and the 32-bit file 1,800,624 bytes, in Windows 10 22H2 they are 1,848,032 and 1,544,480 bytes. Microsoft signs it through a catalog, so the Properties window may show no Digital Signatures tab, although the file is genuine.

Every Windows release has its own build of mfplat.dll, updated together with Windows. Winbindex lists 308 distinct Microsoft builds; the table shows the newest one indexed for each release and the update that delivered it.

Public DLL catalogues have collected 20 copies of mfplat.dll uploaded from PCs, from version 10.0.14393.0 to 12.0.10586.494. Many come from older Windows releases such as Windows Vista, 7 and 8.1, whose Media Foundation had other version numbers. The table lists each with its checksums, so you can tell which one you have.

None of these replaces the file your Windows ships: the newest build indexed for Windows is 10.0.28000.3231, and each release keeps its own. If the check on this page finds your file in this list, it is most likely an older Microsoft build that was copied somewhere by hand, often into a game folder to silence the missing file error. Remove the copy, and add the Media Feature Pack or repair Windows instead.

Copies uploaded by users to a public DLL catalogue, read on 14 October 2026. We list their checksums so you can identify a file; we do not offer them for download and we did not verify each one against Microsoft's signature.