Image
What is a .asf file?
A .asf file is an Advanced Systems Format. This is an image format — a picture, drawing or graphic. Confusingly, this extension has been used by 5 different formats over the years — they're all listed below.
This extension has been used by more than one format
5 different formats have claimed .asf over the years, so two files with the same extension aren't necessarily the same kind of thing.
How to open a .asf file
- GIMP (free) and IrfanView open a very wide range of image formats, including obsolete ones.
- XnView MP is the best bet for unusual or legacy image types.
- Your operating system's built-in viewer may work for mainstream formats.
The registry records this extension against Advanced Systems Format, Windows Media Video, Windows Media Audio and others, so software from that family is the most likely match.
How to convert a .asf file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
MIME type
When a .asf file travels over the web, servers label it with one of these MIME types:
application/vnd.ms-asfvideo/x-ms-wmvaudio/x-ms-wmaThe technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .asf.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Advanced Systems Format | — | application/vnd.ms-asf | fmt/131 |
| Windows Media Video | — | video/x-ms-wmv | fmt/133 |
| Windows Media Audio | — | audio/x-ms-wma | fmt/132 |
| Electronic Arts Music | — | — | x-fmt/137 |
| StratGraphics Data File | — | — | x-fmt/362 |