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The .asf, .wma, and .wmv file name extensions represent the standard Windows Media file format. The .asf file name extension is normally used with Windows Media-based content created by using Windows Media Tools 4.0. The .wma and .wmv file name extensions were introduced as standard naming conventions with Windows Media Encoder 7 to enable users to easily differentiate between audio-only (.wma) files and video (.wmv) files. However, the three extensions can be used interchangeably. Some tools and services that were created for use with earlier versions of Windows Media Technologies require the .asf extension to accept the content. You can simply rename any .wma or .wmv file with the .asf extension to use them with those tools. (However, it is recommended that you use the most current tool or service, when possible.)