| qpm | Quick Pallet Maker Data |
| qpp | QPresenter Pro Presentation |
| qpt | QuarkXPress Project Template |
| qpw | Quattro Pro for Windows Spreadsheet |
| qtl | QuickTime Media Link |
| qtw | Qtext Text Document |
| qud | QuarkXPress Auxiliary Dictionary Data |
| qvd | QlikView Data Only File |
| qvg | QPainter Vector Graphic Data |
| qvpp | QlikView Extension Properties Page |
| qvw | QlikView Document |
| qwd | QuarkXPress Web Document |
| qwt | QuarkXPress Web Document Template |
| qxb | QuarkXPress Book |
| qxd | QuarkXPress Document |
| qxl | QuarkXPress Library |
| qxt | QuarkXPress Document Template |
| r0f | RingCentral Fax Document |
| r0z | RingCentral Compressed Fax Document |
| r2d | RISA-2D Document |
| rad | Radiance Scene |
| ran | Ransen Dexterpen Document |
| rbc | Easy Resume Creator Pro Document |
| rcad | RealCADD Drawing |
| rcs | RandomControl Arion Scene |
| rd3 | Ray Dream 3D Scene |
| rd4f | Ray Dream 3D v4 Model |
| rdf | Resource Description Framework |
| rdf | SmartWare Report Definition File |
| rdfs | SemanticWorks Document |
| rdl | Report Definition Language File |
| rdlx | Power View Report Document |
| rdo | Xerox Raster Document Object |
| rds | Ray Dream Studio Scene |
| readme | Readme Document |