ASF
Writableaudio · also known as ASF
The Advanced Systems Format is an extensible file format developed by Microsoft for storing multimedia data streams. It comprises a Header Object, which describes the properties of the data streams, a Data Object, which contains the actual data streams stored in Data Packets and, optionally, one or more Index Objects. ASF files can contain audio, video and still image data streams, and the format supports streaming across networks. ASF supports a variety of audio, video and still image compression types, although it is most widely used for storing Windows Media Audio and Video encoded data.
Identify it
| Extensions | .asf |
|---|---|
| MIME types | video/x-ms-asfapplication/vnd.ms-asfapplication/ms-asfapplication/x-mplayer2video/x-la-asfvideo/x-ms-asf-plugin |
| Signatures | 3026b2758e66cf11a6d900aa0062ce6c at byte 0 (File Formats Wiki) |
| PRONOM | fmt/131 |
| Wikidata | Q379741 |
| Library of Congress | fdd000067 |
| Apple UTI | com.microsoft.advanced-systems-format |
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- Q847465Open source
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From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.