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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .Q | Open Source | Data Files | Tinn-R Editor Data | Tinn-R Editor | Open Source |
| .Q43 | Unknown Developer | Data Files | Aqbanking Q43 File Format | AqBanking | Open Source |
| .QCI | Quadratron Systems | Uncommon Files | Cliq Accessories Phonebook Index | Massively Parallel Quantum Chemistry Program | Open Source |
| .QCOW2 | Open Source | Disk Image Files | QEMU Copy On Write Version 2 Disk Image | Quick Emulator (QEMU) | Open Source |
| .QDP | NASA | Data Files | Quick And Dandy Plotter File | MPQDraft | Open Source |
| .QFX | Intuit, Inc. | Data Files | Quicken Financial Exchange File | GnuCash | Open Source |
| .QIF | Intuit, Inc. | Data Files | Quicken Interchange Format File | GnuCash | Open Source |
| .QPK | Unknown Developer | Data Files | Qt Extended Installable Package | Qt Extended | Open Source |
| .QPS | Open Source | Data Files | CUTEr QPS Model | CUTEr | Open Source |
| .QT | Apple | Video Files | Apple QuickTime Movie | Eltima Elmedia Player | Open Source |
| .QTK | Apple | Vector Image Files | Apple QuickTake Picture | Darktable | Open Source |
| .QTM | Apple | Video Files | Apple QuickTime Movie | Eltima Elmedia Player | Open Source |
| .QUAD | Open Source | Compressed Files | QUAD Compressed Archive File | QUAD | Open Source |
| .QVM | Open Source | System Files | Q Virtual Machine | Q (emulator) | Open Source |
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