The File Extensions Database

.LSF File Extension

  • Developer by: Microsoft Corporation
  • Category: Digital video and movie Files

What is an .LSF file?

.LSF is Advanced Streaming Format

The lsf file extension is associated with the Advanced Streaming Format developed by Microsoft.

Advanced Streaming Format (sometimes known as Active Streaming Format) is a container format designed by Microsoft to support audio and video playback from a variety of sources including both local playback and internet delivery.

The format is designed to allow playback to commence without the complete file being available. This makes it suitable for internet use where playback can begin soon after download commences or for PVR-type functions such as pausing live TV.

The container can be used to hold a variety of video and audio codecs but it is most commonly used for the WMV and WMA codecs. Other streams such as subtitles can also be included in the format.

The format supports inclusion of meta-data such as video clip name, song title etc. Support for DRM is also provided.

MIME types:

How to open:

Use compatible tools to work with *.lsf files.

How to convert:

Compatible tools may be able to export *.lsf files to other formats.

How to solve problems with LSF files

  • Associate the LSF file extension with the correct application. On :
    Windows: Right click on any LSF file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.LSF files". Mac: Right click (or Ctrl-click) the LSF file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .LSF is Advanced Streaming Format. Because only the current version supports the latest LSF file format. Search, therefore, e.g. on the Microsoft Corporation manufacturer website after an available .LSF is Advanced Streaming Format update.
  • To make sure that your LSF file is not corrupted or virus-infected, get the file again and scan it with antivirus software.