| File Extension: | 669 |
| File Type Description: | UNIS Composer 669 Module |
| File Type Developer: | Open Source |
| Primary Associated Software: | Nullsoft Winamp |
| Primary Software Developer: | Nullsoft |
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Release of the OpenMPT software program prompted the development of the UNIS Composer 669 Module file type by Open Source. Internal website statistics show that 669 files are most popular with users in China and those running the Windows 10 operating system. Google Chrome is the predominant internet browser used by this population.
 | Schism Tracker by Open Source |
 | OpenMPT by Open Source |
 | Nullsoft Winamp by Nullsoft |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Android |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .HSC | Aspen Technology, Inc. | CAD Files | Aspen HYSYS Simulation File |
| .MP4V | Moving Picture Experts Group | Video Files | MPEG-4 Video File |
| .VGM | Richard Bannister | Audio Files | Video Game Music File |
| .PLS | Various Developers | Audio Files | Audio Playlist |
| .HMI | Human Machine Interfaces | Audio Files | HMI Audio File |
| .B4S | Nullsoft | Audio Files | Winamp Playlist File |
| .WV | David Bryant | Audio Files | WavPack Audio File |
| .SPS | IBM | Data Files | SPSS Program File |
| .VAG | Sony | Audio Files | Sony Playstation/PS2 Compressed Sound File |
| .KRX | Various Developers | Audio Files | Karaoke MIDI File |
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