Lotus 1-2-3 is a spreadsheet application developed by IBM prior to 2000 and is still available on the IBM website. If the file extension ASF is associated with Lotus 1-2-3, the file is categorized as a font file type which stores font styles that are compatible with Lotus applications. The files are typically saved in a compressed format using an array of video codecs but are most commonly stored using the Windows Media Audio (WMA) codec or WMV (Windows Media Video) codec. In addition to audio and video, Advanced Streaming Format files contain metadata which describes headers, titles, and other data used for structuring videos.

The Advanced Streaming Format is also commonly referred to as Advanced Systems Format and is a format developed by Microsoft for the purpose of providing a multimedia format which is not dependent upon specific operating platforms, communications protocols, or data streaming methods. If the ASF file extension is defined as an Advanced Streaming Format, the file is categorized as a video file type which contains multimedia data that has been synchronized to support a wide variety of data delivery methods. ASF files contain data and information related to the program that created the file.

The most common association is the Advanced Streaming Format, but the file extension can also be created with Lotus 1-2-3, APL*Plus, and Statgraphics. The file extension ASF is associated with multiple programs and applications and various file types.

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