| .SLAP | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SMART2 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SMH | Oracle Corporation | Textdateien | Sealed MHT Document | Unknown Software | Unknown Developer |
| .SML2 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SMN | Unknown Developer | Textdateien | ParaGraph WorkScript Data | Unknown Software | Unknown Developer |
| .SNC | Swiftpage, Inc. | Einstellungsdateien | ACT! E-mail/folder Synchronization File | Unknown Software | Unknown Developer |
| .SND | Open Source | Audiodateien | Sound File | Unknown Software | Unknown Developer |
| .SNF | The Open Group | Fontdateien | UNIX Font | Unknown Software | Unknown Developer |
| .SNIFFER | Unknown Developer | Textdateien | Sniffer Trace File | Unknown Software | Unknown Developer |
| .SOFTWARE | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SOUP | Unknown Developer | Textdateien | Message / E-mail File | Unknown Software | Unknown Developer |
| .SO_ | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SP2 | Amusement Vision (SEGA) | Spieldateien | Super Ball 2 Level File | Super Ball 2 | Unknown Developer |
| .SPAM | Unknown Developer | Webdateien | Spam E-mail Message | Unknown Software | Unknown Developer |
| .SPARSE | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SPIFF | Joint Photographic Experts Group | Rasterbilddateien | Still Picture Interchange File Format | Unknown Software | Unknown Developer |
| .SPRITES | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SRH | BMC | Textdateien | BMC Remedy AR System Server Saved Search | Unknown Software | Unknown Developer |
| .SRO | Unknown Developer | Textdateien | MADCOW Multi-Site ATIS Data Collection Working Group Data | Unknown Software | Unknown Developer |
| .SS2 | Unknown Developer | Textdateien | Terrasoft SAS Program File | Unknown Software | Unknown Developer |
| .SS3 | Unknown Developer | Audiodateien | Singer Song Writer Audio File | Unknown Software | Unknown Developer |
| .SSCA | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SSD??= | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SSTMP | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SSY | Unknown Developer | Komprimierte Dateien | ScreenShare Compressed Data | ScreenShare | Unknown Developer |
| .STACK | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .STAGE1 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .STAR | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .STARTUP | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .STDF | Teradyne | Textdateien | Standard Test Data Format | Unknown Software | Unknown Developer |
| .STEGANO | Unknown Developer | Textdateien | Steganographic Image File | Unknown Software | Unknown Developer |
| .STORAGE | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .STS | DuoS DSEMU | Spieldateien | DuoS DSEMU Saved State File | DuoS DSEMU | Unknown Developer |
| .STV | Unknown Developer | Textdateien | SofTV Authoring Data | Unknown Software | Unknown Developer |
| .SU | Unknown Developer | Sonstige Dateien | Country Code Top-level Domain | Unknown Software | Unknown Developer |
| .SUL | Unknown Developer | Rasterbilddateien | GFA Raytrace Image | GFA Raytrace | Unknown Developer |
| .SVTREPORTER | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SWD_RAP | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .SWR | Unknown Developer | Textdateien | SageWorld Anti-Hacker Program File | Unknown Software | Unknown Developer |
| .SXT | FMJ-Software | Audiodateien | Propellerheads Reason 2 NN-XT Sound Data | Formula Graphics | Unknown Developer |
| .SY# | Unknown Developer | Backupdateien | Darn! Backup File | Unknown Software | Unknown Developer |
| .SYMBOLS | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SYMLINK | Unknown Developer | Sonstige Dateien | Uncommon File Extension | Unknown Software | Unknown Developer |
| .SYNTAX | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SYSLOG | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .SZS | Nintendo | Textdateien | Wii Game Data File | CTools | Unknown Developer |
| .S_S | Unknown Developer | Sonstige Dateien | Eru/erd File | Unknown Software | Unknown Developer |
| .T04 | Tobias Svensson | 3D-Dateien | Top 4 Compressed Data File | top 4 | Unknown Developer |
| .TABLE1 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TABLES | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TAL | Adobe Systems Incorporated | Textdateien | Adobe TypeAlign Text Illustration File | Unknown Software | Unknown Developer |
| .TALK | Unknown Developer | Textdateien | Text To Speech File | Unknown Software | Unknown Developer |
| .TALK2 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TASP | Unknown Developer | Spieldateien | Strategy Planner Data File | Tactical Assault Strategy Planner | Unknown Developer |
| .TCO | Unknown Developer | Textdateien | T9000 Object Module | Unknown Software | Unknown Developer |
| .TDR | PO KSI | Backupdateien | ArVid Tape Backup | Top Draw | Unknown Developer |
| .TDT | Sony | Videodateien | AVCHD Thumbnail File | Unknown Software | Unknown Developer |
| .TEASERS2 | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TEBK | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .TECH | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TEK | Unknown Developer | Textdateien | ASITIC Technology File | ASITIC | Unknown Developer |
| .TELL | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TEMP | Safer Networking Ltd. | Sonstige Dateien | Temporary (Temp) File | Original Program That Created The File | Unknown Developer |
| .TEST | Unknown Developer | Textdateien | Testing File | Unknown Software | Unknown Developer |
| .TESTING | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TFB | Unknown Developer | Sonstige Dateien | Unknown Apple II Data File | Unknown Software | Unknown Developer |
| .TFR | LucasArts Entertainment Company, LLC | Spieldateien | TIE Fighter Pilot File | Unknown Software | Unknown Developer |
| .TG1 | Unknown Developer | Sonstige Dateien | On Target Project File | Unknown Software | Unknown Developer |
| .TGR | The U.S. Census Bureau | GIS-Dateien | Tiger Line Data | Unknown Software | Unknown Developer |
| .THML | Unknown Developer | Entwicklerdateien | Theological HTML Document | Theological Markup Language (ThML) | Unknown Developer |
| .THW | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .TICKET | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TID | Sony | Videodateien | AVCHD Thumbnail File | Unknown Software | Unknown Developer |
| .TIK | Unknown Developer | Entwicklerdateien | Script File For Game Textures | Unknown Software | Unknown Developer |
| .TILE | XnSoft | Rasterbilddateien | Eclipse Image | Unknown Software | Unknown Developer |
| .TIPS | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TJL | Unknown Developer | Backupdateien | VAXTPU Editor Backup File | Unknown Software | Unknown Developer |
| .TJT | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .TJZ | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .TKI | Unknown Developer | Sonstige Dateien | Mime: Application/x-tkined | Unknown Software | Unknown Developer |
| .TNL | Unknown Developer | 3D-Dateien | Thumbnail Image Format | Unknown Software | Unknown Developer |
| .TO | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TOAD | Unknown Developer | Sonstige Dateien | FunkyToad System File | FunkyToad Network | Unknown Developer |
| .TRACKS | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TRANSFERIR | Unknown Developer | Sonstige Dateien | Unknown File Type | Unknown Software | Unknown Developer |
| .TRAVEL | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TRD | Marco Pontello | Textdateien | TrID Definitions Package | TR Assistant | Unknown Developer |
| .TRIAL | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TRIF | Tiling Task Group (TTG) | Rasterbilddateien | Tiled Raster Interchange Format | Unknown Software | Unknown Developer |
| .TRUETYPE | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TSH | CENiX, Inc. | Audiodateien | Cenix Audio | Unknown Software | Unknown Developer |
| .TTO | Unknown Developer | Sonstige Dateien | Client Access Data Specification File | Unknown Software | Unknown Developer |
| .TTS | SumTotal Systems | Textdateien | ToolBook Translation System File | TrueTime | Unknown Developer |
| .TVLINK | Unknown Developer | Sonstige Dateien | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TVW | Unknown Developer | Sonstige Dateien | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TVX | Doug Cutting | Sonstige Dateien | Apache Lucene Term Vector Index File | Unknown Software | Unknown Developer |
| .TVZ | Unknown Developer | Sonstige Dateien | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TWN | Unknown Developer | Einstellungsdateien | Scanner Settings File | Unknown Software | Unknown Developer |
| .TWO | Apple | Textdateien | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .TXG | ESRI | Sonstige Dateien | Georeference Subobject File | Unknown Software | Unknown Developer |
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