| qxt | QuarkXPress Document Template |
| r0f | RingCentral Fax Document |
| r0z | RingCentral Compressed Fax Document |
| r2d | RISA-2D Document |
| rad | Radiance Scene |
| rail | DeckTools Custom Rail Design |
| ran | Ransen Dexterpen Document |
| rap | Rapidocs Document |
| rb4 | Resume Builder 4 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 |
| 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 |
| red | CADViewer Redline Markup |
| rels | Microsoft Office 2007 Relationships Data |
| rep | SAP Business Objects Report |
| rest | Docutils reStructuredText Document |
| ret | SAP Business Objects Report Template |
| revit | Autodesk Revit Document |
| rft | Revisable-Form Text |
| rgo | RepliGo Document |
| rhif | LiveQuartz Document |
| rig | vRigger Design File |
| ris | Research Information Systems Citation |
| rit | Velrita Document |
| rlc | Graphtec Studio RLC Raster |
| rlp | RLPlot Document |
| rm5 | RevMan v5 Review |
| rmc | RootsMagic Chart |
| rmh | Rights-managed HTML Document |
| rml | Redline Markup Language Document |
| rmr | ResumeMaker Resume |
| rod | Actuate e.Report Report Object Design |
| roff | Unformatted Manual Page |
| rolf | RELUX Open Luminaire Format Document |
| row | Actuate e.Report HTML Report Document |
| rox | Actuate e.Report Report Object Executable |
| rp0 | RescuePro 3000 Invoice Document |
| rp1 | RescuePro 3000 Invoice Document |
| rp2 | RescuePro 3000 Invoice Document |
| rp3 | RescuePro 3000 Invoice Document |
| rp4 | RescuePro 3000 Invoice Document |
| rp5 | RescuePro 3000 Invoice Document |
| rp6 | RescuePro 3000 Invoice Document |
| rp7 | RescuePro 3000 Invoice Document |
| rp8 | RescuePro 3000 Invoice Document |
| rpd | RonyaSoft Poster Designer Document |
| rplt | RecurDyn Plot Document |
| rpmsg | Microsoft Restricted Permission Message |
| rptdocument | BiRT Report Document |
| rptr | RafflePrinter Document |
| rpttemplate | BiRT Report Template |
| rptx | Spiceworks Report Document |
| rqy | Microsoft Excel OLE DB Query |
| rrb | RoboRally Board Editor Board |
| rrf | Metathesaurus Rich Release Format Document |
| rs | RapidSketch Document |
| rs1 | RETScreen Spreadsheet Document |
| rsd | SpeedQuest Template |
| rsdoc | DesignSpark Mechanical Document |
| rsf | RapidSketch Settings Data |
| rsl | Corel Paradox Report |
| rsm | WinWay Resume Deluxe Resume Data |
| rsml | Requirements State Machine Language Document |
| RootSystemML Data |
| rsq | SpeedQuest Questionnaire |
| rss | RSS Feed File |
| rst | reStructuredText File |
| rtab | Randy Tab Guitar Tablature |
| rtb | CA Report Template Builder Document |
| rtd | RagTime Document |
