File Type Advanced Systems Format File IconAdvanced Systems Format File
File Format Proprietary (Microsoft)
Usage Referenced by an application; not meant to be opened manually; may run a program or script when opened
Rank ★ ★ ★  Common

Media container format developed by Microsoft, primarily for streaming media; specifies the structure of the audio or video stream, but not the encoding method; can be compressed using a variety of video codecs.

ASF files often contain Windows Media Audio (.WMA) or Windows Media Video (.WMV) data.

Open With

IconMicrosoft Windows Media Player

IconNullsoft Winamp

IconCyberLink PowerProducer


IconVideoLAN VLC media player

IconShedWorx Smart Converter

IconAiseesoft Video Converter Ultimate for Mac


IconVideoLAN VLC media player

Updated 2007