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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .4TH | Open Source | Developer Files | Forth Language File | Kate | KDE |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Kate | KDE |
| .ASCII | Sublime HQ Pty Ltd | Text Files | ASCII Text | Kate | KDE |
| .CFG | Unknown Developer | Developer Files | Configuration File | Kate | KDE |
| .CONFIG | Unknown Developer | Developer Files | Configuration File | Kate | KDE |
| .DIRECTORY | KDE | Settings Files | KDE Folder View Properties File | KDE (K Desktop Environment) | KDE |
| .DOK | Nenad Hrg | Settings Files | DesktopOK Icons Layout File | Kate | KDE |
| .DTD | Syncro Soft | Developer Files | Document Type Definition File | Kate | KDE |
| .FKT | KDE | Data Files | KmPlot Data File | KmPlot | KDE |
| .GAL | Molecular Devices | Data Files | GenePix Array List | Kate | KDE |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Kate | KDE |
| .ISO | Igor Pavlov | Disk Image Files | Disc Image File | K3b | KDE |
| .KSS | FabTrol Systems | Graphic Files | FabTrol MRP Template | KDE (K Desktop Environment) | KDE |
| .KWL | KDE | Data Files | KWalletManager File | KWalletManager | KDE |
| .LHS | SourceForge | Developer Files | Literate Haskell Script | Kate | KDE |
| .LIT | Microsoft Corporation | eBook Files | Microsoft Reader eBook File | Kate | KDE |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | Kate | KDE |
| .MIM | Internet Engineering Task Force | Encoded Files | Multi-Purpose Internet Mail Message File | KMail | KDE |
| .MIME | Various Developers | Encoded Files | Multi-Purpose Internet Mail Extension | KMail | KDE |
| .NLS | Uri Wilensky | Developer Files | NetLogo Source Code File | Kate | KDE |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Kate | KDE |
| .ODB | Various Developers | Database Files | OpenDocument Database | Calligra Suite | KDE |
| .ODF | Oracle Corporation | Uncommon Files | OpenDocument Formula | Calligra Suite | KDE |
| .ODG | Apache Software Foundation | Vector Image Files | OpenDocument Graphic File | Calligra Suite | KDE |
| .ODS | Oracle Corporation | Spreadsheet Files | OpenDocument Spreadsheet | Calligra Sheets | KDE |
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Calligra Suite | KDE |
| .PHP | Panic | Web Files | PHP Source Code File | Kate | KDE |
| .PLAN | KDE | Data Files | Calligra Plan Document | Calligra Suite | KDE |
| .RAW | Unknown Developer | Camera Raw Files | Raw Image Data File | digiKam | KDE |
| .README | The Document Foundation | Text Files | Readme Text Document File | Kate | KDE |
| .SKZ | SuperKaramba Project | Settings Files | SuperKaramba Theme | Plasma Desktop | KDE |
| .TORRENT | BitTorrent | Uncommon Files | BitTorrent Information File | KTorrent | KDE |
| .VCS | Microsoft Corporation | Data Files | vCalendar Event File | Calligra Suite | KDE |
| .VNT | Sony | Text Files | Sony Ericsson Mobile Phone vNote File | Kate | KDE |
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