| Q | Tinn-R Editor Data | Data Files | 2 | 2 |
| Q0 | Japanese Q0 Bitmap Image | Raster Image Files | 1 | 1 |
| Q00 | Quicken 2000 Tax Return |
Data Files
| 1 | 1 |
| Q01 | Quicken 2001 File | Uncommon Files | 1 | 1 |
| Q07 | QuickTax 2007 Tax Return Data |
Data Files
| 1 | 1 |
| Q08 | QuickTax 2008 Tax Return |
Data Files
| 1 | 1 |
| Q09 | QuickTax 2009 Tax Return File |
Uncommon Files
| 1 | 1 |
| Q1 | Winamp Equalizer Preset File | Settings Files | 1 | 1 |
| Q1Q | LunarCell Photoshop Plug-in | Plugin Files | 1 | 1 |
| Q2 | Winamp Equalizer Auto-Load Presets File | Audio Files | 1 | 1 |
| Q2D | Quick 3D Cover Design File |
Settings Files
| 1 | 1 |
| Q2Q | Flexify Photoshop Plug-in |
Plugin Files
| 1 | 1 |
| Q2RENDERER | Quake 2 For Mac Renderer Plugin File |
Plugin Files
| 1 | 1 |
| Q3D | Quest3D Project File |
Data Files
| 2 | 2 |
| Q43 | Aqbanking Q43 File Format |
Data Files
| 1 | 1 |
| Q4Q | Solar Cell Photoshop Plug-in |
Plugin Files
| 1 | 1 |
| Q4W | Qualitek-4 Exported Data |
Data Files
| 1 | 1 |
| Q5Q | SuperBladePro Presets File |
Settings Files
| 1 | 1 |
| Q7Q | India Ink Photoshop Plug-in |
Plugin Files
| 1 | 1 |
| Q8R | Flood Photoshop Plug-in |
Plugin Files
| 1 | 1 |
| Q99 | Quicken 99 File |
Data Files
| 1 | 1 |
| Q9Q | BladePro Presets File |
Settings Files
| 1 | 1 |
| Q9R | Glitterato Photoshop Plug-In |
Plugin Files
| 1 | 1 |
| Q9S | Mr. Contrast Photoshop Plug-In |
Plugin Files
| 1 | 1 |
| QAC | C++ Dedicated PROGRUN Data | Developer Files | 1 | 1 |
| QAD | Corel WordPerfect Office Thumbnail |
Raster Image Files
| 2 | 2 |
| QAF | Qedoc Quiz Player Autolaunch Data |
Data Files
| 1 | 1 |
| QAFIBOE | Unknown File Type |
Uncommon Files
| 1 | 1 |
| QAG | Norton Desktop Quick Access Group File |
Settings Files
| 1 | 1 |
| QAL | OpenMap Quality Data | GIS Files | 1 | 1 |
| QAM | Omnis Studio Audio Data |
Audio Files
| 2 | 2 |
| QAP | Omnis Quartz Application File |
Developer Files
| 1 | 1 |
| QAR | QlikView Extension |
Plugin Files
| 1 | 1 |
| QAT | Microsoft Office Quick Access Toolbar File |
Settings Files
| 1 | 1 |
| QB | Diploma Question Bank File |
Data Files
| 1 | 1 |
| QB1 | Quicken Data |
Data Files
| 1 | 1 |
| QB2013 | QuickBooks 2013 File |
Data Files
| 1 | 1 |
| QB2015 | QuickBooks 2015 Backup | Backup Files | 2 | 1 |
| QBA | QuickBooks Accountant's Copy Work File |
Data Files
| 2 | 1 |
| QBB | QuickBooks Backup File |
Backup Files
| 2 | 1 |
| QBD | Quicken Keyboard Layout File |
Settings Files
| 1 | 1 |
| QBE | Corel Quattro Pro Saved Query File |
Data Files
| 1 | 1 |
| QBI | QuickBooks Crash Roll Back File | Temporary Files | 1 | 1 |
| QBJ | QuickBooks General Journal Entry File |
Data Files
| 1 | 1 |
| QBK | QuickTax Backup File |
Backup Files
| 1 | 1 |
| QBL | Business Lawyer Document Files |
Data Files
| 1 | 1 |
| QBM | QuickBooks Portable Company File |
Backup Files
| 2 | 1 |
| QBO | QuickBooks Online Bank Statement File | Web Files | 4 | 2 |
| QBP | QuickBooks Printer File |
Settings Files
| 1 | 1 |
| QBQUERY | MySQL Query Browser Saved SQL Query Command Data | Database Files | 1 | 1 |
| QBR | QuickBooks Report Template |
Data Files
| 1 | 1 |
| QBS | Microsoft QuickBasic Program File |
Data Files
| 2 | 2 |
| QBT | QuickBooks Temporary Rebuild File |
Temporary Files
| 1 | 1 |
| QBW | QuickBooks Data File |
Data Files
| 2 | 1 |
| QBX | QuickBooks Accountant Transfer File |
Backup Files
| 1 | 1 |
| QBXML | QuickBooks XML Format File |
Data Files
| 1 | 1 |
| QC | Half-Life Model Compiler Script File | 3D Image Files | 6 | 2 |
| QCA | Ericsson Phone Doubler Quick Call Data |
Data Files
| 1 | 1 |
| QCALL | Phone Doubler Quick Call File |
Data Files
| 1 | 1 |
| QCC | NIOBRARA QUCM Firmware File | System Files | 2 | 2 |
| QCD | QuarkXpress Article Data |
Uncommon Files
| 1 | 1 |
| QCH | Quicken DOS Data File |
Data Files
| 2 | 2 |
| QCI | Cliq Accessories Phonebook Index |
Uncommon Files
| 2 | 2 |
| QCK | Jigsaw 2 Astrological Tool File |
Data Files
| 2 | 2 |
| QCM | Quick Command Data |
Data Files
| 1 | 1 |
| QCN | Qualcomm QPST Drive Backup |
Backup Files
| 1 | 1 |
| QCOW2 | QEMU Copy On Write Version 2 Disk Image | Disk Image Files | 1 | 1 |
| QCP | PureVoice Audio File |
Audio Files
| 1 | 1 |
| QCT | Memory-Map Imported Map File |
GIS Files
| 3 | 3 |
| QD | SHARP MZ-series Emulator Data |
Data Files
| 1 | 1 |
| QD0 | Omnis Quartz Segment 10 Data File |
Database Files
| 1 | 1 |
| QD1 | Omnis Quartz Segment 1 Data File |
Database Files
| 1 | 1 |
| QD2 | Omnis Quartz Segment 2 Data File |
Database Files
| 1 | 1 |
| QD5 | Omnis Quartz Segment 5 Data File |
Database Files
| 1 | 1 |
| QD6 | Omnis Quartz Segment 6 Data File |
Database Files
| 1 | 1 |
| QD8 | Omnis Quartz Segment 8 Data File |
Database Files
| 1 | 1 |
| QDA | Quadruple D Archive File | Compressed Files | 1 | 1 |
| QDAT | QuickTime Install Cache File |
Data Files
| 2 | 2 |
| QDB | Quicken 5 & 6 Data File |
Data Files
| 2 | 2 |
| QDC | Quick-Devis Database |
Database Files
| 1 | 1 |
| QDE | QDOS Executable | Executable Files | 1 | 1 |
| QDF | Snapform File |
Data Files
| 4 | 3 |
| QDP | Quick And Dandy Plotter File |
Data Files
| 2 | 2 |
| QDS | Windows Directory Query File |
Uncommon Files
| 1 | 1 |
| QDU | The Suffering: Ties That Bind Game Data | Game Files | 1 | 1 |
| QDV | Random Dot QDV Bitmap Image |
Raster Image Files
| 1 | 1 |
| QE4 | Kingpin Life Of Crime Settings File |
Game Files
| 1 | 1 |
| QED | Memory-Map Navigator Map File |
GIS Files
| 1 | 1 |
| QEF | Microsoft Excel Query File |
Data Files
| 2 | 1 |
| QEL | Quicken Electronic Library File |
Data Files
| 1 | 1 |
| QEM | ExpensAble Report File |
Data Files
| 1 | 1 |
| QEP | IRMA Workstation File |
Uncommon Files
| 1 | 1 |
| QES | Askiadesign Questionnaire File |
Data Files
| 1 | 1 |
| QEX | ExpensAble Data File |
Data Files
| 1 | 1 |
| QF | Nokia (Ovi) Maps Version Data |
Settings Files
| 10 | 4 |
| QFD | Quicken Data |
Data Files
| 1 | 1 |
| QFL | Family Lawyer Document |
Data Files
| 2 | 1 |
| QFX | Quicken Financial Exchange File |
Data Files
| 3 | 1 |
| QHC | QHC |
Settings Files
| 1 | 1 |
| QHF | QIP Saved History File |
Data Files
| 1 | 1 |
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