.B4S File Extension

File Type:
Winamp Playlist File

Having trouble opening .b4s extension? Don't panic! This page explains what b4s files are as well as suggests programs you may use to open b4s files. You can download these programs through this page.

What is a B4S file?

B4s file extension has Winamp Playlist file type, developed by Nullsoft, which is associated with the "audio files" category.

In older versions of the popular Winamp media player user’s playlists are saved in files with this extension. They use the XML format and contain a list of audio files and associated metadata. B4S files were used for saving musical playlists and favorite mixes. After a while the B4S format was surpassed by the more common .M3U format.


To learn how you can open the given file, read the information below.

b4s file icon
File Type:
Winamp Playlist File
Audio Files

How to open B4S file?

Double click the b4s file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .b4s extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the b4s extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the b4s file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open B4S files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the b4s file as well. Download Universal File Viewer for your OS.

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