| .123 | IBM | Regnearksfiler | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .AAR | Apache Software Foundation | Datafiler | Axis Archive | Apache Axis2 | Apache Software Foundation |
| .APT | Apache Software Foundation | Tekstfiler | Almost Plain Text File | Apache OpenOffice | Apache Software Foundation |
| .ASHX | Microsoft Corporation | Webfiler | ASP.NET Web Handler File | OpenOffice Writer | Apache Software Foundation |
| .ASP | Microsoft Corporation | Webfiler | Active Server Page | OpenOffice Writer | Apache Software Foundation |
| .ATT | Unknown Developer | Webfiler | Web Form Post Data File | OpenOffice Writer | Apache Software Foundation |
| .AXD | Microsoft Corporation | Webfiler | ASP.NET Web Handler File | OpenOffice Writer | Apache Software Foundation |
| .B | Rockstar Games | Spilfiler | Grand Theft Auto 3 Saved Game File | OpenOffice Writer | Apache Software Foundation |
| .BAU | Sun Microsystems | Indstillingsfiler | Apache OpenOffice AutoText File | Apache OpenOffice | Apache Software Foundation |
| .BIN | Unknown Developer | Disk billedfiler | Binary Disk Image File | Apache OpenOffice | Apache Software Foundation |
| .CF | Proofpoint, Inc. | Indstillingsfiler | Sendmail Configuration File | Apache OpenOffice | Apache Software Foundation |
| .CFG | Unknown Developer | Udviklerfiler | Configuration File | OpenOffice Writer | Apache Software Foundation |
| .CFS | Apache HTTP Project Management Committee | Ikke Almindelige Filer | Lucene Compound Index File | Apache Lucene | Apache Software Foundation |
| .CONFIG | Unknown Developer | Udviklerfiler | Configuration File | OpenOffice Writer | Apache Software Foundation |
| .CPIO | Power Software Ltd | Kodet filer | Unix CPIO Archive | Apache Commons Compress | Apache Software Foundation |
| .CSV | Unknown Developer | Datafiler | Comma Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .CVS | Unknown Developer | Datafiler | Comma Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .DB | Dwayne Richard Hipp | Databasefiler | Mobile Device Database File | Apache OpenOffice | Apache Software Foundation |
| .DBF | dBase, LLC | Databasefiler | Database File | Apache OpenOffice | Apache Software Foundation |
| .DIF | Microsoft Corporation | Datafiler | Data Interchange Format | Apache OpenOffice | Apache Software Foundation |
| .DIZ | Unknown Developer | Tekstfiler | Description In Zip File | OpenOffice Writer | Apache Software Foundation |
| .DO | Unknown Developer | Webfiler | Java Servlet | Apache Tomcat | Apache Software Foundation |
| .DOC | Microsoft Corporation | Tekstfiler | Microsoft Word Document (before The 2007 Version) | Apache OpenOffice | Apache Software Foundation |
| .DOCM | Microsoft Corporation | Tekstfiler | Word Open XML Macro-Enabled Document | Apache OpenOffice | Apache Software Foundation |
| .DOCX | Microsoft Corporation | Tekstfiler | Microsoft Word Open XML Document | OpenOffice Writer | Apache Software Foundation |
| .DON | Apache Software Foundation | Datafiler | Apache OpenOffice (OpenOffice.org) Log | Apache OpenOffice | Apache Software Foundation |
| .DOT | Microsoft Corporation | Sideopsætningsfiler | Word Document Template | Apache OpenOffice | Apache Software Foundation |
| .DOTM | Microsoft Corporation | Sideopsætningsfiler | Word 2007 XML Macro-Enabled Template | Apache OpenOffice | Apache Software Foundation |
| .DOTX | Microsoft Corporation | Sideopsætningsfiler | Word 2007 XML Template | Apache OpenOffice | Apache Software Foundation |
| .DPC | Microsoft Corporation | Datafiler | Microsoft Office Resource File | Apache OpenOffice | Apache Software Foundation |
| .DUMP | Microsoft Corporation | Systemfiler | Dump File | Apache OpenOffice | Apache Software Foundation |
| .EAR | Oracle Corporation | Eksekverbare filer | Java Enterprise Archive File | Apache Geronimo | Apache Software Foundation |
| .EMF | Microsoft Corporation | Vektorbilledfiler | Enhanced Windows Metafile | Apache OpenOffice | Apache Software Foundation |
| .FAQ | The Document Foundation | 3D-billedfiler | Frequently Asked Questions Document | OpenOffice Writer | Apache Software Foundation |
| .FDT | Final Draft | Tekstfiler | Final Draft 5-7 Template | Apache Lucene | Apache Software Foundation |
| .FPR | Hewlett-Packard | Datafiler | Audit Workbench Project | OpenOffice Writer | Apache Software Foundation |
| .FRQ | Open Source | Datafiler | Bibexcel File | Apache Lucene | Apache Software Foundation |
| .FTL | Apache Software Foundation | Udviklerfiler | FreeMarker Template File | FreeMaker | Apache Software Foundation |
| .GFW | Open Source | GIS-filer | GIF World File | OpenOffice Writer | Apache Software Foundation |
| .HRL | Ericsson Computer Science Laboratory | Udviklerfiler | Erlang Header File | OpenOffice Writer | Apache Software Foundation |
| .HTACCESS | Apache Software Foundation | Webfiler | Apache HTACCESS File | Apache HTTP Server | Apache Software Foundation |
| .HWP | Hancom, Inc. | Tekstfiler | Hanword Document | Apache OpenOffice | Apache Software Foundation |
| .ICF | Zoom Telephonics | Sikkerhedskopifiler | Zoom Router Configuration File | OpenOffice Writer | Apache Software Foundation |
| .JNLP | Oracle Corporation | Webfiler | Java Web Start File | Apache OpenOffice | Apache Software Foundation |
| .JS | NetScape | Webfiler | JavaScript File | OpenOffice Writer | Apache Software Foundation |
| .JSCRIPT | NetScape | Webfiler | JavaScript File | OpenOffice Writer | Apache Software Foundation |
| .JSW | JustSystems | Tekstfiler | Ichitaro 4.0 Document | Apache Tomcat | Apache Software Foundation |
| .JTL | Apache Software Foundation | Datafiler | JMeter Test Results Data File | Apache JMeter | Apache Software Foundation |
| .LDI | Trudi Ersvaer (co-developer) | Tekstfiler | LDIF File | Apache Directory Server/Studio | Apache Software Foundation |
| .LST | Unknown Developer | Tekstfiler | Data List | OpenOffice Writer | Apache Software Foundation |
| .LYT | Adminsoft | Datafiler | Adminsoft Document Layout File | OpenOffice Writer | Apache Software Foundation |
| .MAB | Mozilla | Ikke Almindelige Filer | Mozilla Address Book | Apache OpenOffice | Apache Software Foundation |
| .ME | Unknown Developer | Ikke Almindelige Filer | Temporary Delete Me File | OpenOffice Writer | Apache Software Foundation |
| .MET | Emulex Corporation | Datafiler | eMule Resource File | Apache OpenOffice | Apache Software Foundation |
| .NFO | Microsoft Corporation | Systemfiler | System Information File | OpenOffice Writer | Apache Software Foundation |
| .NOW | The Document Foundation | Tekstfiler | Readme Text Document File | OpenOffice Writer | Apache Software Foundation |
| .OBR | Micro Focus International plc | Udviklerfiler | Borland C++ Object Browser Data | Apache Tomcat | Apache Software Foundation |
| .ODB | Various Developers | Databasefiler | OpenDocument Database | Apache OpenOffice | Apache Software Foundation |
| .ODC | Microsoft Corporation | Indstillingsfiler | Office Data Connection File | Apache OpenOffice | Apache Software Foundation |
| .ODCCUBEFILE | Apache Software Foundation | Ikke Almindelige Filer | OpenDocument 1 Chart | Apache OpenOffice | Apache Software Foundation |
| .ODF | Oracle Corporation | Ikke Almindelige Filer | OpenDocument Formula | Apache OpenOffice | Apache Software Foundation |
| .ODG | Apache Software Foundation | Vektorbilledfiler | OpenDocument Graphic File | Apache OpenOffice | Apache Software Foundation |
| .ODI | Apache Software Foundation | Rasterbilledfiler | OpenDocument Image | Apache OpenOffice | Apache Software Foundation |
| .ODM | Open Source | Tekstfiler | OpenDocument Master Document | Apache OpenOffice | Apache Software Foundation |
| .ODP | Oracle Corporation | Datafiler | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .ODS | Oracle Corporation | Regnearksfiler | OpenDocument Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .ODT | Oracle Corporation | Tekstfiler | OpenDocument Text Document | Apache OpenOffice | Apache Software Foundation |
| .OOS | Apache Software Foundation | Regnearksfiler | Apache OpenOffice (OpenOffice.org) Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .OOT | Apache HTTP Project Management Committee | Datafiler | Apache OpenOffice Text Document | Apache OpenOffice | Apache Software Foundation |
| .OTC | Apache Software Foundation | Ikke Almindelige Filer | OpenDocument Chart Template | Apache OpenOffice | Apache Software Foundation |
| .OTG | Apache Software Foundation | Vektorbilledfiler | OpenDocument Graphic Template | Apache OpenOffice | Apache Software Foundation |
| .OTH | Apache Software Foundation | Webfiler | OpenDocument HTML Template | Apache OpenOffice | Apache Software Foundation |
| .OTI | Apache Software Foundation | Rasterbilledfiler | OpenDocument Image Template | Apache OpenOffice | Apache Software Foundation |
| .OTP | Oracle Corporation | Datafiler | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .OTS | Apache Software Foundation | Regnearksfiler | OpenDocument Spreadsheet Template | Apache OpenOffice | Apache Software Foundation |
| .OTT | Apache Software Foundation | Tekstfiler | OpenDocument Document Template | Apache OpenOffice | Apache Software Foundation |
| .OXT | Sun Microsystems | Plug-in-filer | Apache OpenOffice Extension | Apache OpenOffice | Apache Software Foundation |
| .PAR | Siemens PLM Software | CAD-filer | Solid Edge Part File | Apache OpenOffice | Apache Software Foundation |
| .PBA | Oracle Corporation | Plug-in-filer | OpenOffice.org Basic Protected Module File | Apache OpenOffice | Apache Software Foundation |
| .PCD | PokéCheats | Spilfiler | Pokémon Wonder Card File | Apache OpenOffice | Apache Software Foundation |
| .PHTML | Opera Software | Webfiler | PHP Web Page | Apache Tomcat | Apache Software Foundation |
| .PMK | David Harris | Indstillingsfiler | Pegasus Mail Keyboard Settings | Apache OpenOffice | Apache Software Foundation |
| .PO | Sublime HQ Pty Ltd | Udviklerfiler | Portable Object | Apache OpenOffice | Apache Software Foundation |
| .POM | Apache Software Foundation | Ikke Almindelige Filer | Maven Build File | Maven | Apache Software Foundation |
| .POT | Microsoft Corporation | Datafiler | PowerPoint Template | Apache OpenOffice | Apache Software Foundation |
| .POTX | Microsoft Corporation | Datafiler | PowerPoint Open XML Presentation Template | OpenOffice Impress | Apache Software Foundation |
| .PPS | Microsoft Corporation | Datafiler | PowerPoint Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPSX | Microsoft Corporation | Datafiler | PowerPoint Open XML Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPT | Microsoft Corporation | Datafiler | PowerPoint Presentation | Apache OpenOffice | Apache Software Foundation |
| .PPTX | Microsoft Corporation | Datafiler | PowerPoint Open XML Presentation | Apache OpenOffice | Apache Software Foundation |
| .PRG | Open Source | Eksekverbare filer | Program File | OpenOffice Writer | Apache Software Foundation |
| .PSV | Sony | Spilfiler | PlayStation 2 Save File | Apache OpenOffice | Apache Software Foundation |
| .PSW | Microsoft Corporation | Ikke Almindelige Filer | Windows Password Reset Disk File | Apache OpenOffice | Apache Software Foundation |
| .PWI | Microsoft Corporation | Tekstfiler | Pocket Word Document | Apache OpenOffice | Apache Software Foundation |
| .README | The Document Foundation | Tekstfiler | Readme Text Document File | OpenOffice Writer | Apache Software Foundation |
| .RNG | Nokia | Lydfiler | Nokia Composer Ringtone | Apache OpenOffice | Apache Software Foundation |
| .RPT | SAP | Datafiler | Crystal Reports File | OpenOffice Writer | Apache Software Foundation |
| .SBL | Adobe Systems Incorporated | Grafiske Filer | Shockwave Flash Object | Apache OpenOffice | Apache Software Foundation |
| .SCRIPT | Unknown Developer | Eksekverbare filer | Generic Script File | OpenOffice Writer | Apache Software Foundation |
| .SDA | Oracle Corporation | Vektorbilledfiler | StarOffice Drawing | Apache OpenOffice | Apache Software Foundation |
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