.ASF File Extension

Advanced Systems Format File

Developer Microsoft
Popularity
3.7  |  182 Votes
Category Video Files
Format Binary

What is an ASF file?

An ASF file is a multimedia file stored in the Advanced Systems Format (ASF), a proprietary video and audio container format. It may store only audio data or video and audio data, along with optional metadata, such as title, author, and bibliographic copyright data. Microsoft developed ASF files primarily for streaming media online.

More Information
Screenshot of a .asf file in VideoLAN VLC media player 3
ASF file open in VideoLAN VLC media player 3

The ASF container format only specifies the structure of how the audio or video streams online, which depends on various factors, such as network bandwidth and server performance. In addition, the ASF format does not specify the codec used to encode the audio or video stored in the ASF container format.

While the .asf file extension may be used for media files saved in the ASF format, the .wma and .wmv extensions are more commonly used. If the ASF container format stores audio, it is typically saved as a Windows Media Audio (.WMA) file. It is typically saved as a Windows Media Video (.WMV) file if it stores video. Audio and video data stored within these files may be compressed using a variety of video codecs.

How to open an ASF file

You can open ASF files with various media players. In Windows, you can use Microsoft Movies & TV or Windows Media Player. They are both included with Windows. In macOS and Linux, you can open ASF files with VideoLAN VLC media player (multiplatform). And in iOS, you can open ASF files with PentaLoop PlayerXtreme Media Player.

Open and view .ASF files with File Viewer Plus.Free Download

Programs that open or reference ASF files

Updated December 6, 2021

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