| File Extension: | B4S |
| File Type Description: | Winamp Playlist File |
| File Type Developer: | Nullsoft |
| Primary Associated Software: | Nullsoft Winamp |
| Primary Software Developer: | Nullsoft |
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Release of the Nullsoft Winamp software program prompted the development of the Winamp Playlist File file type by Nullsoft. Internal website statistics show that B4S files are most popular with users in Japan and those running the Windows 10 operating system. A high percentage of these users browse the web using Google Chrome.
 | Nullsoft Winamp by Nullsoft |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Android |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .IT | Open Source | Audio Files | Impulse Tracker Module |
| .PTM | Microsoft Corporation | GIS Files | MapPoint Map File |
| .FLV | Adobe Systems Incorporated | Video Files | Animate Video File |
| .RBS | Microsoft Corporation | Backup Files | Windows Installer Rollback Script File |
| .SA2 | Nullsoft | Audio Files | Suprise! Adlib Tracker Music Module |
| .NSV | Nullsoft | Video Files | Nullsoft Streaming Video File |
| .KRX | Various Developers | Audio Files | Karaoke MIDI File |
| .MPEG | Unknown Developer | Video Files | MPEG Movie |
| .WMV | Microsoft Corporation | Video Files | Windows Media Video File |
| .BAM | Broad Institute | Audio Files | Bob's Adlib Music File Format |
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