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File Name Extensions

There are specific guidelines for the use of file name extensions for Windows Media metafiles. Windows Media metafile name extensions are used to identify the different types of Windows Media files. A file name extension provides an Independent Software Vendor (ISV) with information about the rendering requirements of an application that uses a particular extension, and enables content authors to target general types of media players.

The file name extension guidelines are listed in the following table. It is recommended that a file's MIME type, located in the file header, be used for file-type identification.

File name extension MIME type File content
.wmaaudio/x-ms-wmaWindows Media file with audio content only. Typically used to download and play files or to stream content.
.wmvvideo/x-ms-wmvWindows Media file with audio and/or video content. Typically used to download and play files or to stream content.
.asfvideo/x-ms-asfLegacy content. Typically used to download and play files or to stream content. May contain audio and/or video content. Typically used to download and play files or to stream content.
.wmvideo/x-ms-wmReserved
.waxaudio/x-ms-waxMetafiles that reference Windows Media files with .asf, .wma, or .wax file name extensions.
.wvxvideo/x-ms-wvxMetafiles that reference Windows Media files with .wma, .wmv, .wvx, or .wax file name extensions.
.asxvideo/x-ms-asfMetafiles that reference Windows Media files with .wma, .wax, .wmv, .wvx, .asf, or .asx file name extensions.
.wmxvideo/x-ms-wvxReserved.

 

Remarks

Scripting and digital rights management (DRM) must be supported by any application that renders Windows Media files.

Related topics

Windows Media Metafile Elements Reference
Windows Media Metafile Guide
Windows Media Metafile Reference

 

 

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