| qbx | BLOCKS Landing Page Data |
| qc | QuakeC Source Code |
| qc7 | SAS 7 Sequential Engine Catalog Data |
| qcf | QuickBasic Coordinates File |
| qd7 | SAS 7 Sequential Engine Data |
| qdl | QDL Language Program |
| qf | Qompose Web Page Template |
| qf7 | SAS 7 Sequential Engine FDB Data |
| qhc | QT Help Collection |
| qi7 | SAS 7 Sequential Engine Index Data |
| qip | Altera Quartus II IP File |
| ql$ | Compressed QuickBASIC Library |
| qlb | QuickBASIC Library |
| qlf | SWI-Prolog Quick Load File |
| qlp | Yasol QLP Program |
| qm | Qedit QM Data |
| Qt Compiled Translation Source |
| qm7 | SAS 7 Sequential Engine MDDB Data |
| qma | Qedit Data |
| qml | QML Source Code |
| QT Meta Language Data |
| qmlc | QQmlEngine QML Cache |
| qmltypes | Qt QML Types Data |
| qmm | QM Compiled Macro |
| qpg | QNX Package Generation File |
| qph | QT Phrase Books Data |
| qpk | Qt Extended Package |
| qpm | QNX Package Manifest File |
| qpr | Dinkum EC++ Abridged Library |
| QNX Package Repository File |
| Visual FoxPro Query Program |
| qps | CUTEr QPS Model |
| qpx | Visual FoxPro Compiled Query Program |
| qr7 | SAS 7 Sequential Engine Item Store Data |
| qrc | QT Resource Collection File |
| qrp | QuickReport Data |
| qs | QL-R-kemi Styled Source |
| qs7 | SAS 7 SE Stored Data Step Program |
| qsl | Qedit Script |
| qss | QT Style Sheet |
| qsys | Intel Qsys System Data |
| qt7 | SAS 7 Sequential Engine Audit Data |
| qtd | Qt Creator Trace Data |
| que | PDP-10 Queue Data |
| qv7 | SAS 7 Sequential Engine View Data |
| qvs | QlikView Script |
| qx | Quex Input File |
| Quexal Source Code |
| qxm | Quexal Macro File |
| r | OpenEdge ABL Compiled Program |
| Pegasus Mail Resource File |
| R Source Code |
| RatFor Source Code |
| REBOL Source Code |
| r0 | VirtualBox Data |
| r43 | IAR System MSP430 Object Module |
| rad | Citrix XenApp Rapid Application Delivery Data |
| VRAD Lights Data |
| WinDev RAD Information |
| radius | Ruby-Radius Script |
| rake | Rake File |
| rakefile | Ruby Makefile |
| raml | RESTful API Modeling Language Document |
| rap | RAPTOR Data |
| rapp | Ride7 Application |
| ray | Synopsys LightTools Ray Data |
| rb | RealBasic Source Code |
| Ruby Console Application |
| rba | Xilinx ISE BitGen Readback ASCII Data |
| rbb | Xilinx ISE BitGen Readback Binary Data |
| rbbas | RealBasic Class Data |
| rbc | Rembo-C Script Source |
| rbd | Xilinx ISE BitGen Expected Readback Data |
| rbe | RealView Debugger Connection Properties |
| rbfrm | RealBasic Window Data |
| rbj | XRK Compiled Redcode Object File |
| rbm | RealBasic Menu |
| rbmnu | RealBasic Menu Data |
| rbo | RealBasic Class |
| rbres | RealBasic Resource Data |
