| .SPF | StorageCraft | Sikkerhedskopifiler | ShadowProtect Full Backup File | VMware vCenter Converter | VMware |
| .SPG | Speed Guide, Inc. | Sikkerhedskopifiler | TCP Optimizer Backup File | TCP Optimizer | Speed Guide, Inc. |
| .SPI | StorageCraft | Sikkerhedskopifiler | ShadowProtect Incremental Backup File | ShadowProtect | StorageCraft |
| .SPS | IBM | Sikkerhedskopifiler | SPSS Program File | IBM SPSS | IBM |
| .SQB | Redgate Software | Sikkerhedskopifiler | SQL Backup SQL Server Backup | SQL Backup | Redgate Software |
| .SRR | Open Source | Sikkerhedskopifiler | ReScene Metadata File | ReScene | Open Source |
| .SSB | Joshua Cannon Butcher | Sikkerhedskopifiler | Simply Safe Backup Archive | Simply Safe Backup | Joshua Cannon Butcher |
| .SSC | Microsoft Corporation | Sikkerhedskopifiler | SourceSafe Status File | Microsoft Visual Studio | Microsoft Corporation |
| .SSN | Samsung Electronics | Sikkerhedskopifiler | Samsung Kies Notes Backup | Samsung Kies | Samsung Electronics |
| .STG | Microsoft Corporation | Sikkerhedskopifiler | ActiveSync Backup File | Microsoft ActiveSync | Microsoft Corporation |
| .SUN | Sun Microsystems | Sikkerhedskopifiler | Sun Raster Graphic File | GIMP | The GIMP Development Team |
| .SV$ | Autodesk, Inc. | Sikkerhedskopifiler | AutoCAD Automated Backup File | Autodesk AutoCAD | Autodesk, Inc. |
| .SV2I | Symantec Corporation | Sikkerhedskopifiler | Symantec System Index File | VMware vCenter Converter | VMware |
| .SVL | SecurStar | Sikkerhedskopifiler | Scramdisk Volume | DriveCrypt | SecurStar |
| .SVS | Nintendo | Sikkerhedskopifiler | Game Boy Advance Saved State File | Game Boy Advance | Nintendo |
| .SY# | Unknown Developer | Sikkerhedskopifiler | Darn! Backup File | Unknown Software | Unknown Developer |
| .TBK | SumTotal Systems | Sikkerhedskopifiler | ToolBook Project File | ToolBook | SumTotal Systems |
| .TCS | Lennert Ploeger | Sikkerhedskopifiler | TreeComp Snapshot Data | TreeComp | Lennert Ploeger |
| .TDB | Google | Sikkerhedskopifiler | Android Thumbnail Cache | Google Android | Google |
| .TDR | PO KSI | Sikkerhedskopifiler | ArVid Tape Backup | ArVid | PO KSI |
| .TIG | Texas Instruments, Inc. | Sikkerhedskopifiler | TI Connect Backup File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TIS | Acronis | Sikkerhedskopifiler | True Image Script | Acronis True Image | Acronis |
| .TJF | Hewlett-Packard | Sikkerhedskopifiler | VAXTPU Backup | OpenVMS | Hewlett-Packard |
| .TJL | Unknown Developer | Sikkerhedskopifiler | VAXTPU Editor Backup File | Unknown Software | Unknown Developer |
| .TLD | The Eclipse Foundation | Sikkerhedskopifiler | Tag Library Descriptor File | Notepad++ | Don Ho |
| .TLG | Intuit, Inc. | Sikkerhedskopifiler | QuickBooks Transaction Log File | QuickBooks | Intuit, Inc. |
| .TMB | ARRIS | Sikkerhedskopifiler | Timbuktu Pro Connection Document | Timbuktu | ARRIS |
| .TMP | Mozilla | Sikkerhedskopifiler | General Temporary File | Internet Explorer | Microsoft Corporation |
| .TMR | Apimac | Sikkerhedskopifiler | Apimac Timer Document | Apimac Timer | Apimac |
| .TRN | Microsoft Corporation | Sikkerhedskopifiler | SQL Server Transaction Log Backup File | Microsoft SQL Server | Microsoft Corporation |
| .UAS | Ulead Systems | Sikkerhedskopifiler | Ulead PhotoImpact Backup File | PhotoImpact | Corel |
| .UCI | SysDevSoftware | Sikkerhedskopifiler | UFS Explorer Backup File | SysDevSoftware UFS Explorer | SysDevSoftware |
| .UTB | Unknown Developer | Sikkerhedskopifiler | µTBackup Backup | µTBackup | Unknown Developer |
| .UWT | UniTechnology Limited | Sikkerhedskopifiler | UniTrader | UniTrader | UniTechnology Limited |
| .V2B | Texas Instruments, Inc. | Sikkerhedskopifiler | Texas Instruments TI Voyage 200 Backup File | TiLP | SourceForge |
| .V2I | Symantec Corporation | Sikkerhedskopifiler | Norton Ghost Virtual Volume Image | Symantec Ghost Solution Suite | Symantec Corporation |
| .VBK | Veeam Software | Sikkerhedskopifiler | Veeam Backup File | Veeam Backup & Replication | Veeam Software |
| .VBM | Veeam Software | Sikkerhedskopifiler | Veeam Backup Metadata File | Veeam Backup & Replication | Veeam Software |
| .VDK | GRAVITY | Sikkerhedskopifiler | Ragnarok 2 Game Data File | Ragnarok Online | GRAVITY |
| .VIB | Veeam Software | Sikkerhedskopifiler | Veeam Backup File | Veeam Backup & Replication | Veeam Software |
| .VRB | Veeam Software | Sikkerhedskopifiler | Veeam Incremental Backup File | Veeam Backup & Replication | Veeam Software |
| .VSR | Microsoft Corporation | Sikkerhedskopifiler | Microsoft Access Report | Microsoft Access | Microsoft Corporation |
| .W40 | Microsoft Corporation | Sikkerhedskopifiler | Windows 95 Backup File | Microsoft Windows | Microsoft Corporation |
| .WBCAT | Microsoft Corporation | Sikkerhedskopifiler | Microsoft Windows Backup Information | Microsoft Windows | Microsoft Corporation |
| .WBK | Microsoft Corporation | Sikkerhedskopifiler | Word Document Backup | Microsoft Word | Microsoft Corporation |
| .WBU | Samsung Electronics | Sikkerhedskopifiler | Samsung PC Studio Backup File | Samsung PC Studio | Samsung Electronics |
| .WIN | Microsoft Corporation | Sikkerhedskopifiler | FoxPro Window Settings | Microsoft Visual FoxPro | Microsoft Corporation |
| .WJF | Corel | Sikkerhedskopifiler | WinZip Job File | WinZip | Corel |
| .WPB | PGN Inc. | Sikkerhedskopifiler | OpenCanvas 1.1 Image | openCanvas | PGN Inc. |
| .WX | Open Source | Sikkerhedskopifiler | Wanam Xposed Backup File | Wanam Xposed | Open Source |
| .XBK | SMART Technologies | Sikkerhedskopifiler | SMART Notebook File | MimioStudio | Mimio |
| .XLK | Microsoft Corporation | Sikkerhedskopifiler | Excel Backup File | Microsoft Excel | Microsoft Corporation |
| .XML-PREV | Oracle Corporation | Sikkerhedskopifiler | VirtualBox XML Settings Backup | Oracle VM VirtualBox | Oracle Corporation |
| .ZAP13 | Siemens AG | Sikkerhedskopifiler | Siemens TIA V13 Archived Project | TIA Portal | Siemens AG |
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