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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .HXX | The Qt Company | Developer Files | C++ Source Code Header File | Qt SDK | The Qt Company |
| .PRI | The Qt Company | Developer Files | Qt Project Include File | Qt SDK | The Qt Company |
| .PRO | Adobe Systems Incorporated | Web Files | Adobe Proto Design File | Qt SDK | The Qt Company |
| .QCH | Quicken | Data Files | Quicken DOS Data File | Qt SDK | The Qt Company |
| .QHC | Digia Oyj | Settings Files | QHC | Qt SDK | The Qt Company |
| .QML | Digia Oyj | Developer Files | QT Meta Language File | Qt SDK | The Qt Company |
| .QPH | Digia Oyj | Data Files | Qt Phrase Books File | Qt SDK | The Qt Company |
| .QRC | Quark Software Inc. | Data Files | QuarkXPress Required Component File | Qt SDK | The Qt Company |
| .QSS | Digia Oyj | Settings Files | Qt Style Sheet | Qt SDK | The Qt Company |
| .QTD | The Qt Company | Developer Files | Qt Creator Trace Data | Qt SDK | The Qt Company |
| .TS | Various Developers | Video Files | Video Transport Stream File | Qt SDK | The Qt Company |
| .UI | Digia Oyj | Developer Files | User Interface File | Qt SDK | The Qt Company |
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