How to open a .asf file (Windows, Mac, Linux)

Q: Why can't I open my .asf file?

Usually your computer lacks an app that understands ASF. Install one of the apps listed here, or convert the file to a more common format.

A .asf file is a Advanced Systems Format File. If double-clicking does nothing, your computer simply does not have an app that reads ASF yet. Here is how to fix that on each operating system, using free software wherever possible.

Open a .asf file step by step

Confirm the file really is a .asf. Drop it into the WhatFileType file identifier, which reads its signature without uploading anything.
On Windows, open it with Windows Media Player (legacy) or VLC.
On Mac, use VLC or Elmedia Player.
On Linux, try VLC or ffmpeg.
Still stuck? Convert the .asf to mp4, which opens more widely.

Best apps to open .asf files

Windows

Windows Media Player (legacy)
VLC
MPC-HC

macOS

VLC
Elmedia Player

Linux

VLC
ffmpeg

Before you open it: Mostly safe. ASF supports script commands inside the stream that legacy Windows Media Player could act on (like opening URLs), so play files from unknown sources in a modern player such as VLC.

Frequently asked questions

Why can't I open my .asf file?

Almost always because no installed app understands ASF. Install one of the apps above, or convert the file to a format your existing software already reads.

What is the difference between .asf, .wmv and .wma?

One container, three names. ASF is the container format; Microsoft used .wmv for video content and .wma for audio, and generic or streamed content kept the .asf extension.

How do I play an .asf file?

VLC plays ASF on all platforms. On older Windows, Windows Media Player opens it natively.