| .123 | IBM | Regnearksfiler | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .12M | IBM | Regnearksfiler | Lotus 1-2-3 SmartMaster File | IBM Collaboration Solutions | IBM |
| .AST | Apple | Regnearksfiler | ClarisWorks Assistant File | Apple AppleWorks | Apple |
| .AVF | SourceForge | Regnearksfiler | Avermedia Recorded Video Backup | Project X | SourceForge |
| .AWS | Autodesk, Inc. | Regnearksfiler | AutoCAD Work Space File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BKS | Microsoft Corporation | Regnearksfiler | NTBackup Settings File | Microsoft Windows NT Backup - Restore Utility | Microsoft Corporation |
| .BWB | Baler Software | Regnearksfiler | Visual Baler Spreadsheet | Visual Baler | Baler Software |
| .CELL | Hancom, Inc. | Regnearksfiler | Thinkfree Office NEO Cell Workbook | Thinkfree Office NEO | Hancom, Inc. |
| .COL | Open Source | Regnearksfiler | Bibexcel File | BibExcel | Open Source |
| .DEF | Microsoft Corporation | Regnearksfiler | Module Definition File | Microsoft Visual Studio | Microsoft Corporation |
| .DFG | Interscape | Regnearksfiler | Data Flask Grid File | Interscape Data Flask | Interscape |
| .EDDX | EdrawSoft | Regnearksfiler | Edraw XML FIle | Edraw Max | EdrawSoft |
| .EDX | EdrawSoft | Regnearksfiler | Edraw XML FIle | Edraw Max | EdrawSoft |
| .ESS | Bethesda Softworks | Regnearksfiler | The Elder Scrolls Saved Game | Skyrim VR | Bethesda Softworks |
| .FAFF | Unknown Developer | Regnearksfiler | Professional Calc Spreadsheet File | Professional Calc | Unknown Developer |
| .FCS | Interscape | Regnearksfiler | Flow Cytometry Standard File | Verity Software House V-Comp | Interscape |
| .FM | Adobe Systems Incorporated | Regnearksfiler | FrameMaker Document | Adobe FrameMaker | Adobe Systems Incorporated |
| .FP | FileMaker Inc. | Regnearksfiler | FileMaker Pro Spreadsheet | FileMaker Pro | FileMaker Inc. |
| .GNUMERIC | Open Source | Regnearksfiler | Gnumeric Spreadsheet | Gnumeric | Open Source |
| .GSH | Microsoft Corporation | Regnearksfiler | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .GSHEET | Google | Regnearksfiler | Google Drive Spreadsheet | Google Drive | Google |
| .GSW | Unknown Developer | Regnearksfiler | GraphShow Worksheet File | Unknown Software | Unknown Developer |
| .IMP | Lotus Software | Regnearksfiler | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .JZZ | Lotus Software | Regnearksfiler | Lotus Jazz Spreadsheet File | Lotus Jazz | Lotus Software |
| .LCW | Lucid Technologies, Inc | Regnearksfiler | Lucid 3-D Spreadsheet | Lucid 3-D | Lucid Technologies, Inc |
| .MAR | Microsoft Corporation | Regnearksfiler | Microsoft Access Report | Microsoft Access | Microsoft Corporation |
| .NB | Wolfram Research | Regnearksfiler | Mathematica Notebook | Wolfram Research Mathematica | Wolfram Research |
| .NUMBERS | Apple | Regnearksfiler | Numbers Spreadsheet File | Numbers | Apple |
| .ODS | Oracle Corporation | Regnearksfiler | OpenDocument Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .OGW | OriginLab | Regnearksfiler | Origin Workbook File | OriginLan Origin Viewer | OriginLab |
| .OOS | Apache Software Foundation | Regnearksfiler | Apache OpenOffice (OpenOffice.org) Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .OTS | Apache Software Foundation | Regnearksfiler | OpenDocument Spreadsheet Template | Apache OpenOffice | Apache Software Foundation |
| .PMD | Adobe Systems Incorporated | Regnearksfiler | PageMaker Document | Adobe InDesign | Adobe Systems Incorporated |
| .PMV | SoftMaker Software | Regnearksfiler | PlanMaker Spreadsheet Template | Softmaker Office | SoftMaker Software |
| .QPW | Corel Corporation | Regnearksfiler | Corel Quattro Pro Spreadsheet | Corel WordPerfect X8 | Corel |
| .QUICKEN | Intuit, Inc. | Regnearksfiler | QUICKEN For Mac Financial Data | Intuit Quicken | Quicken |
| .RDF | Unknown Developer | Regnearksfiler | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .SDC | Stardock Corporation | Regnearksfiler | Stardock Central Download Archive | Stardock Central | Stardock Corporation |
| .SHT | The Document Foundation | Regnearksfiler | HTML File With Server Side Includes | LibreOffice | The Document Foundation |
| .SILK | Microsoft Corporation | Regnearksfiler | Microsoft Excel Symbolic Link Format | Microsoft Excel | Microsoft Corporation |
| .SMX | MakeMusic, Inc. | Regnearksfiler | SmartMusic XML File | SmartMusic | MakeMusic, Inc. |
| .SPW | Quantitative Software Management, Inc. | Regnearksfiler | SLIM-Master Plan Workbook File | SLIM Suite | Quantitative Software Management, Inc. |
| .STC | Adobe Systems Incorporated | Regnearksfiler | Contribute Connection Key File | Adobe Contribute 6.5 | Adobe Systems Incorporated |
| .SXC | Sun Microsystems | Regnearksfiler | StarOffice Calc Spreadsheet | NeoOffice | Planamesa Software Inc. |
| .SXLS | Oracle Corporation | Regnearksfiler | Sealed Excel Spreadsheet | Oracle IRM Desktop | Oracle Corporation |
| .TC6 | Software602 | Regnearksfiler | Calc602 Spreadsheet File | Calc602 | Software602 |
| .TMV | SoftMaker Software | Regnearksfiler | TextMaker Template | Softmaker Office | SoftMaker Software |
| .VC | Software Arts | Regnearksfiler | VisiCalc Spreadsheet | VisiCalc | Software Arts |
| .VCX | H+H Software GmbH | Regnearksfiler | Virtual Disc Definition File | H+H Software Virtual CD | H+H Software GmbH |
| .WB2 | Threefold Photos, Inc. | Regnearksfiler | Webshots Picture File | Webshots Desktop Connect | Threefold Photos, Inc. |
| .WG1 | IBM | Regnearksfiler | Lotus 1-2-3 Worksheet File | Lotus 1-2-3 | IBM |
| .WJ3 | IBM | Regnearksfiler | Lotus 1-2-3 Worksheet File | Lotus 1-2-3 | IBM |
| .WK! | IBM | Regnearksfiler | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .WKE | IBM | Regnearksfiler | Lotus 1-2-3 Educational Version Worksheet | Microsoft Excel | Microsoft Corporation |
| .WKQ | Corel | Regnearksfiler | Quattro Pro For DOS Spreadsheet File | Corel Quattro Pro | Corel |
| .WKZ | Informix Corporation | Regnearksfiler | Wingz Spreadsheet | Wingz | Informix Corporation |
| .WLS | Renault | Regnearksfiler | R-Link Update File | R-Link Toolbox | Renault |
| .WQ! | Corel | Regnearksfiler | Corel Quattro Pro Compressed Spreadsheet | Corel Quattro Pro | Corel |
| .WQ0 | Corel | Regnearksfiler | Quattro Pro For DOS Spreadsheet File | Corel Quattro Pro | Corel |
| .WQ1 | Corel | Regnearksfiler | Quattro Pro For DOS Spreadsheet File | Corel Quattro Pro | Corel |
| .WQ2 | Corel | Regnearksfiler | Quattro Pro For DOS Spreadsheet File | Corel Quattro Pro | Corel |
| .WR! | IBM | Regnearksfiler | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .WR1 | IBM | Regnearksfiler | Lotus Symphony Spreadsheet | IBM Lotus Symphony | IBM |
| .WS | MicroPro International Corp. | Regnearksfiler | WordStar Document | Corel WordPerfect X8 | Corel |
| .XAR | Magix Software GmbH | Regnearksfiler | Xara Xtreme Drawing | Xara Designer Pro X | Magix Software GmbH |
| .XCEL | Microsoft Corporation | Regnearksfiler | Microsoft Excel For Mac Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XL | Microsoft Corporation | Regnearksfiler | Excel Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLR | Microsoft Corporation | Regnearksfiler | Microsoft Works Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLS | Microsoft Corporation | Regnearksfiler | Microsoft Excel 97 To 2003 Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLSB | Microsoft Corporation | Regnearksfiler | Excel Binary Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLSHTML | Microsoft Corporation | Regnearksfiler | Microsoft Excel HTML Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLSM | Microsoft Corporation | Regnearksfiler | Microsoft Excel Open XML Macro-Enabled Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLSMHTML | Microsoft Corporation | Regnearksfiler | Microsoft Excel MIME HTML Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLSX | Microsoft Corporation | Regnearksfiler | Microsoft Excel Open XML Spreadsheet | Microsoft Excel | Microsoft Corporation |
| .XLTHTML | Microsoft Corporation | Regnearksfiler | Microsoft Excel HTML Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
| .XLTM | Microsoft Corporation | Regnearksfiler | Excel Open XML Macro-Enabled Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
| .XLTX | Microsoft Corporation | Regnearksfiler | Excel Open XML Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
| .XLV | Microsoft Corporation | Regnearksfiler | Excel Visual Basic Module File | Microsoft Excel | Microsoft Corporation |
| .XS3 | Open Source | Regnearksfiler | XESS Worksheet | Xess | Open Source |
| .XS4 | Open Source | Regnearksfiler | XESS Worksheet | Xess | Open Source |
| .XS5 | Open Source | Regnearksfiler | XESS Worksheet | Xess | Open Source |
| .XSS | Oracle Corporation | Regnearksfiler | XML Style Sheet | Microsoft Visual Studio | Microsoft Corporation |
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