SOI-e-Spreadsheet-Document-Actuate-Corporation
SOI-MENSI-Trimble-3D-laser-enhanced-3D-scanner-file
SOK-Sokoban-Level-File
SOLITAIRESAVE-MS-Solitaire-Saved-Game-Microsoft-Corporation
SOL-Solution-file-Common-used-with-game-examples-tutorials
SO_-Midiprg-Score-Midiprglite-compressed-file
SOM-Network-serial-numbers-Quattro-Pro
SOM-Sort-information-files-Paradox
SONIC-DigitalMedia-Project-File
SONIC-SonicArranger-audio-file
SON-Song-file-Creative-Labs-SoundBlaster-Studio-II
SOPT-Synclavier-Optical-Disk-Image-File
SOR-Adobe-Flash-Media-Server-File-System-Object-Adobe-Systems-Incorporated
SOR-ChessDB-Repertoire-File-Dr-David-Kirkby
SOR-Corel-Paradox-sort-definition
SOR-Paradox-sort-definition-Header
SOR-Shot-Online-resource-file
SOR-SOR-OTDR-Data
SOR-SOR-OTDR-data-Header
SORT-thoroughbred-basic-direct-sort-file
SORT-Unknown-Apple-II-File
S-OS-2-Spreadsheet
S-OS-2-Spreadsheet-IBM
SOS-Adventure-SOS-compiled-adventure-game-walkthrough
SOS-Adventure-SOS-Compiled-Adventure-Game-Walkthrough-Hungry-Software
SO_-Score-MIDIprglite-Compressed-File
SOS-DRS-OMR-decode-instruction-file
SOS-DRS-SOSKit-barcode-decode-instructions
SOS-Dynamite-VSP-swept-object-style
SOS-EnSight-Master-server-file
SO-Shared-library-file-Unix-equivalent-to-a-Windows-DLL
SOT-Adventure-SOS-adventure-game-walkthrough-source-file
SOT-Adventure-SOS-Adventure-Game-Walkthrough-Source-File-Hungry-Software
SOUND-Macintosh-Sound-Resource-Apple-Inc
SOUNDS-Quake-3-Engine-Sound-Definition-File
SOUNDS-Unknown-Apple-II-File
SOUP-Message-E-mail
SOU-Sound-file-Creative-Labs-SoundBlaster-Studio
SOW-ARJ-archiv
SOW-ARJ-Archive
SOX-e-Spreadsheet-Executable-Actuate-Corporation
SOX-native-Unix-Sox-raw-sound
SOX-Schema-for-Object-Oriented-XML
SOX-Unix-Sox-native-raw-sound
SP1-Various-Games
SP2-Quake2-pcx-8-bit-sprite-builder-file
SP3-Quake2-pcx-32-bit-sprite-builder-file-for-use-with-CyberPunkQE
SP4-Saved-game-Roller-Coaster-Tycoon
SPA-FutureSplash-Flash-file-Macromedia
SPAM-Spam-E-mail-Message
TechTarget file types