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WM file: what it is and how to open it

ASF video. Here is what a .wm file contains, how to open one on any device, and a viewer that opens it right in your browser.

Open a .wm file hereChoose fileRead in your browser. Nothing is uploaded.

What the viewer shows

  • Whether the file matches the .wm signature
  • The first bytes as hex
  • A preview when your browser can display it

What is a .wm file?

A .wm file is an ASF video. Its registered MIME type is video/x-ms-wm, which places it in the video family of formats.

ASF stands for Advanced Streaming Format.

WM is a binary format: the contents are not readable text, so opening it in a text editor shows scrambled characters.

Files of this type usually begin with the bytes 30 26 B2 75. That signature is how programs recognise the format even when the extension is wrong or missing.

The same format is also saved with the extension .asf.

WM file format details

Extension.wm
FormatASF video
MIME typevideo/x-ms-wm
CategoryVideo
Text or binaryBinary
File signature30 26 B2 75
Registered with IANANo
Other extensions.asf

How to open WM files

WindowsVLC media player is free and plays almost every audio and video format, WM included in most cases. Media Player and Films and TV handle the common ones.
MacQuickTime Player plays formats Apple supports. VLC or IINA play most others.
iPhone and iPadThe Files app plays formats Apple supports. VLC for iOS plays most others.
AndroidMost gallery and music apps play common formats; VLC for Android plays almost everything.

Can you convert a .wm file?

TapToConvert does not convert WM files yet. If you can export the file from its program as a common video format, the video converter can turn it into anything else.

WM file FAQ

What is a .wm file?

A .wm file is an ASF video, with the MIME type video/x-ms-wm.

How do I open a .wm file?

VLC media player plays most audio and video formats on Windows, Mac, iPhone and Android.

Is a .wm file safe to open?

WM files hold data rather than programs, but any file from an unknown source can be crafted to exploit the software that opens it. Keep that software up to date. The viewer on this page only reads the bytes and never runs anything.

What is the MIME type of .wm?

video/x-ms-wm. Web servers send this type so browsers know how to handle the file.

Is WM a text or binary format?

Binary. Its contents are not readable as text.

File type facts come from the IANA media type registry, the mime-db project and the freedesktop.org shared MIME database.

Similar file types

Try MP4 to MP3, HEIC, merge PDF or compress video.