| .NV | Q.W.Page Associates Inc | Tietokantatiedostot | NewViews Database File | Q.W. Page NewViews 2 | Q.W.Page Associates Inc |
| .NV2 | Q.W.Page Associates Inc | Tietokantatiedostot | NewViews 2 Database File | Q.W. Page NewViews 2 | Q.W.Page Associates Inc |
| .NX1 | NexusDB Pty | Tietokantatiedostot | NexusDB File | NexusDB | NexusDB Pty |
| .NX2 | NexusDB Pty | Tietokantatiedostot | NexusDB Database File | NexusDB | NexusDB Pty |
| .NYF | Wjj Software | Tietokantatiedostot | MyBase Database File | Wjj Software myBase | Wjj Software |
| .OD4 | Omnis Software | Tietokantatiedostot | Omnis5 Database File | Omnis Studio | Omnis Software |
| .OD9 | Omnis Software | Tietokantatiedostot | Omnis5 Database File | Omnis Studio | Omnis Software |
| .ODB | Various Developers | Tietokantatiedostot | OpenDocument Database | Apache OpenOffice | Apache Software Foundation |
| .OPT | LexisNexis | Tietokantatiedostot | Concordance Database File | LexisNexis Concordance | LexisNexis |
| .OQY | Microsoft Corporation | Tietokantatiedostot | Excel OLAP Query File | Microsoft Excel | Microsoft Corporation |
| .ORA | Unknown Developer | Tietokantatiedostot | OpenRaster Image File | GIMP | The GIMP Development Team |
| .ORD | OMAX Corporation | Tietokantatiedostot | OMAX Routed Data | Unknown Software | Unknown Developer |
| .OTQ | One MarketData, LLC | Tietokantatiedostot | OneTick Query File | OneTick | One MarketData, LLC |
| .OWC | OutWit Technologies | Tietokantatiedostot | OutWit Catch Database | Mozilla Firefox | Mozilla |
| .OXB | Olapxsoftware | Tietokantatiedostot | OlapX Report Portfolio Data File | OlapX Application | Olapxsoftware |
| .OXC | Olapxsoftware | Tietokantatiedostot | OlapX | OlapX Application | Olapxsoftware |
| .PAG | Microsoft Corporation | Tietokantatiedostot | Visual Basic Property PAGe File | Microsoft Visual Basic | Microsoft Corporation |
| .PAN | ProVUE Development | Tietokantatiedostot | Panorama Database File | ProVUE Development Panorama | ProVUE Development |
| .PBD | EaseUS | Tietokantatiedostot | EaseUS Todo Backup Backup File | EaseUS Todo Backup | EaseUS |
| .PCA | Sony | Tietokantatiedostot | Perfect Clarity Audio File | ACID Pro 7 | Magix Software GmbH |
| .PDM | Sybase, Inc | Tietokantatiedostot | PowerDesigner Database File | Sybase PowerDesigner | SAP |
| .PDT | Microsoft Corporation | Tietokantatiedostot | InkWriter Note Taker Template File | Windows Mobile | Microsoft Corporation |
| .PHM | Pro Home Manager, LLC | Tietokantatiedostot | Pro Home Manager Data File | Pro Home Manager | Pro Home Manager, LLC |
| .PLD | Oracle Corporation | Tietokantatiedostot | Oracle Binary Module Text Form | Oracle Database | Oracle Corporation |
| .PNZ | ProVUE Development | Tietokantatiedostot | Panorama Database Set | ProVUE Development Panorama | ProVUE Development |
| .PRK | LucasArts Entertainment Company, LLC | Tietokantatiedostot | Thrillville Park File | Thrillville | Frontier Developments plc |
| .PSAFE3 | Open Source | Tietokantatiedostot | Password Safe Database | Password Safe | Open Source |
| .PW | Pointwise, Inc. | Tietokantatiedostot | Pointwise Database File | Pointwise | Pointwise, Inc. |
| .QBQUERY | MySQL AB | Tietokantatiedostot | MySQL Query Browser Saved SQL Query Command Data | MySQL Query Browser | MySQL AB |
| .QD0 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 10 Data File | Omnis Studio | Omnis Software |
| .QD1 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 1 Data File | Omnis Studio | Omnis Software |
| .QD2 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 2 Data File | Omnis Studio | Omnis Software |
| .QD5 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 5 Data File | Omnis Studio | Omnis Software |
| .QD6 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 6 Data File | Omnis Studio | Omnis Software |
| .QD8 | Omnis Software | Tietokantatiedostot | Omnis Quartz Segment 8 Data File | Omnis Studio | Omnis Software |
| .QDC | Quotalys Ltd. | Tietokantatiedostot | Quick-Devis Database | Quick-Devis Database | Quotalys Ltd. |
| .QMF | IBM | Tietokantatiedostot | IBM Lotus Approach Database Query | Lotus Approach | IBM |
| .QRY | Oracle Corporation | Tietokantatiedostot | Query File | Microsoft SQL Server | Microsoft Corporation |
| .QVD | Qlik | Tietokantatiedostot | QlikView Data File | QlikTech International QlikView | Qlik |
| .QVF | Qlik | Tietokantatiedostot | QlikView Data File | QlikTech International QlikView | Qlik |
| .R2K | BTM Innovation Pty | Tietokantatiedostot | Repertoire 2000 Music Database | Repertoire 2000 | BTM Innovation Pty |
| .RBF | Microsoft Corporation | Tietokantatiedostot | Windows Installer Rollback File | Windows Installer | Microsoft Corporation |
| .REX | Propellerhead | Tietokantatiedostot | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .RFG | Raddon Financial Group | Tietokantatiedostot | RFG Integrator System Database | Integrator | Fiserv, Inc. |
| .RFH | Raddon Financial Group | Tietokantatiedostot | RFG Integrator Householding Database | Integrator | Fiserv, Inc. |
| .RFL | Propellerhead | Tietokantatiedostot | Reason ReFill Sound Bank File | Reason | Propellerhead |
| .RIN | Protronics | Tietokantatiedostot | Retrieve 4GL Database Index | Retrieve 4GL | Protronics |
| .RMW | ALD | Tietokantatiedostot | RAM Commander Database File | RAM Commander | ALD |
| .ROD | RIB Software | Tietokantatiedostot | RIB Office Database File | RIB office | RIB Software |
| .RPC | Synthrone | Tietokantatiedostot | Rich Page Content Document | Synthrone Crafter | Synthrone |
| .RPD | RIB Software | Tietokantatiedostot | RIB Project Database File | iTWO | RIB Software |
| .RSD | Rosetta Stone | Tietokantatiedostot | Rosetta Stone Data File | Rosetta Stone Language Learning | Rosetta Stone |
| .RXD | Attachmate (Micro Focus) | Tietokantatiedostot | Attachmate Reflection X Manager Definition Data File | Attachmate Reflection | Attachmate (Micro Focus) |
| .RXH | Borland | Tietokantatiedostot | Reflex Database Help File | Borland Reflex | Borland |
| .SAS7BDAT | SAS Institute Inc. | Tietokantatiedostot | SAS Data Set File | SAS | SAS Institute Inc. |
| .SBF | Google | Tietokantatiedostot | Android System File | Google Android | Google |
| .SCX | RIX SoftWorks, Inc. | Tietokantatiedostot | ColoRIX Bitmap Graphic File | XnView MP | XnSoft |
| .SD2 | Avid Technology | Tietokantatiedostot | Sound Designer II File | Apple iTunes | Apple |
| .SDF | Microsoft Corporation | Tietokantatiedostot | SQL Server Compact Database File | Microsoft Visual Studio | Microsoft Corporation |
| .SDI | Intuit, Inc. | Tietokantatiedostot | QuickBooks Data File | Intuit QuickBooks Pro | Intuit, Inc. |
| .SDS | Oracle Corporation | Tietokantatiedostot | OpenOffice.org Chart | Apache OpenOffice | Apache Software Foundation |
| .SF1 | The U.S. Census Bureau | Tietokantatiedostot | 2010 Census Summary File 1 | Microsoft Access | Microsoft Corporation |
| .SG3 | SourceForge | Tietokantatiedostot | ChessDB Game File | ChessDB | Interscape |
| .SIS | Valve | Tietokantatiedostot | Steam Game Backup Information File | Steam | Valve |
| .SKC | Borland | Tietokantatiedostot | SideKick For Windows Database File | Borland SideKick | Borland |
| .SLF | Symantec Corporation | Tietokantatiedostot | Symantec License File | Symantec Ghost Solution Suite | Symantec Corporation |
| .SQDB | TedCo Software, LLC | Tietokantatiedostot | SpellQuizzer Database File | SpellQuizzer | TedCo Software, LLC |
| .SQL | Various Developers | Tietokantatiedostot | Structured Query Language Data File | Microsoft Notepad | Microsoft Corporation |
| .SQLITE | Dwayne Richard Hipp | Tietokantatiedostot | SQLite Database File | SQLite | Dwayne Richard Hipp |
| .SQLITEDB | Dwayne Richard Hipp | Tietokantatiedostot | SQLite Database | SQLite | Dwayne Richard Hipp |
| .SR1 | SIR Pty Ltd. | Tietokantatiedostot | SIR Database | SIR/XS | SIR Pty Ltd. |
| .SR3 | SIR Pty Ltd. | Tietokantatiedostot | SIR Database | SIR/XS | SIR Pty Ltd. |
| .SR4 | SIR Pty Ltd. | Tietokantatiedostot | SIR Database | SIR/XS | SIR Pty Ltd. |
| .SSO | Interscape | Tietokantatiedostot | ChessDB Search Options Data | ChessDB | Interscape |
| .SV2 | SAS Institute Inc. | Tietokantatiedostot | SAS View | Base SAS | SAS Institute Inc. |
| .SV7 | Nintendo | Tietokantatiedostot | Saved Game File | No Cash GBA (No$GBA) | Martin Korth |
| .TBM | Nabi Studios | Tietokantatiedostot | Toribash Mod File | Toribash | Nabi Studios |
| .TE | RM Education | Tietokantatiedostot | Textease CT Database File | Textease Studio | RM Education |
| .TFR | LucasArts Entertainment Company, LLC | Tietokantatiedostot | TIE Fighter Pilot File | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .TMD | SoftMaker Software | Tietokantatiedostot | TextMaker Document | Softmaker Office | SoftMaker Software |
| .TMDB | Interfathom | Tietokantatiedostot | TaskMerlin Database File | TaskMerlin | Interfathom |
| .TMZ | The MediGraph Team | Tietokantatiedostot | Medigraph Compressed Database File | Medigraph | The MediGraph Team |
| .TOM | Aptora | Tietokantatiedostot | Total Office Manager Accounting Data | Total Office Manager | Aptora |
| .TPS | TiePie engineering | Tietokantatiedostot | Multi Channel Measurement File | Multi Channel | TiePie engineering |
| .TRC | Microsoft Corporation | Tietokantatiedostot | SQL Server Trace File | Microsoft SQL Server | Microsoft Corporation |
| .TRM | Oracle Corporation | Tietokantatiedostot | Oracle Trace Map File | Oracle Database | Oracle Corporation |
| .UDF | Open Source | Tietokantatiedostot | Universal Disk Format Image File | 7-Zip | Igor Pavlov |
| .UFSD | SysDevSoftware | Tietokantatiedostot | RAW Recovery Signatures Database File | SysDevSoftware UFS Explorer | SysDevSoftware |
| .URD | Kinook Software, Inc. | Tietokantatiedostot | Ultra Recall Database File | Ultra Recall | Kinook Software, Inc. |
| .USR | FileMaker Inc. | Tietokantatiedostot | FileMaker Pro Database File | FileMaker Pro | FileMaker Inc. |
| .UXD | Terria Development | Tietokantatiedostot | URLBase URL Database | URLBase | Terria Development |
| .VAS | EduFlex | Tietokantatiedostot | VirtualAssessor Diagnostic Scenario Database | VirtualAssessor | EduFlex |
| .VDF | Valve | Tietokantatiedostot | Valve Data File | Microsoft Notepad | Microsoft Corporation |
| .VDX | Microsoft Corporation | Tietokantatiedostot | Visio Drawing XML File | OmniGraffle | The Omni Group |
| .VIS | Microsoft Corporation | Tietokantatiedostot | Visibility Image File | Microsoft Flight Simulator 2004 | Microsoft Corporation |
| .VIW | Microsoft Corporation | Tietokantatiedostot | Microsoft SQL Server View Script File | Microsoft SQL Server | Microsoft Corporation |
| .VL | Tailwag Software | Tietokantatiedostot | Visual Labels Project | Visual Labels | Tailwag Software |
| .VPD | Yu Higuchi | Tietokantatiedostot | MikuMikuDance Vocaloid Pose Data File | MikuMikuDance | Yu Higuchi |
| .VPDB | VIP Quality Software | Tietokantatiedostot | VIP Organizer Database | VIP Organizer | VIP Quality Software |
| .VPW | Wheat Stone | Tietokantatiedostot | VoxPro Database File | VoxPro | Wheat Stone |
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