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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .S1A | Oracle Corporation | Encoded Files | Sealed Acrobat Document | Awave Studio | FMJ-Software |
| .S1M | Yamaha Corporation | Audio Files | Yamaha EX5 Waveform Data | Awave Studio | FMJ-Software |
| .SBK | SwishZone | Video Files | SWiSH Project Backup File | Awave Studio | FMJ-Software |
| .SD | Various Developers | Audio Files | Sound Designer Audio File | Awave Studio | FMJ-Software |
| .SDK | Autodesk, Inc. | CAD Files | AutoSketch Drawing | Awave Studio | FMJ-Software |
| .SDX | Kivuto | Uncommon Files | Kivuto Secure Download Manager File | Awave Studio | FMJ-Software |
| .SF | Institut de Recherche et de Coordination Acoustique/Musique (IRCAM) | Audio Files | IRCAM Sound File | Awave Studio | FMJ-Software |
| .SF2 | E-mu Systems | Audio Files | SoundFont 2 Sound Bank | Awave Studio | FMJ-Software |
| .SFARK | Unknown Developer | Compressed Files | Melody Machine Compressed SoundFont File | Awave Studio | FMJ-Software |
| .SFR | Sonic Foundry | Audio Files | Sonic Foundry Sample Resource File | Awave Studio | FMJ-Software |
| .SMP | MakeMusic, Inc. | Audio Files | SmartMusic Performance File | Awave Studio | FMJ-Software |
| .SND | Open Source | Audio Files | Sound File | Awave Studio | FMJ-Software |
| .SOU | LucasArts Entertainment Company, LLC | Game Files | Lucas Arts Sound Data | Awave Studio | FMJ-Software |
| .SVQ | Roland Corporation | Audio Files | Roland Sequencer File | Awave Studio | FMJ-Software |
| .SVX | The Survex Project | GIS Files | Survex Cavern Data File | Awave Studio | FMJ-Software |
| .SYW | Yamaha Corporation | Audio Files | Yamaha SY99/SY85 Audio File | Awave Studio | FMJ-Software |
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