| rcv | Eudora Temporary Download Data |
| rcw | RaceSail Regatta Data |
| rd | Reaction Data File |
| rd1 | DATAIR Retirement Plan Document System Data |
| rd3f | Ray Dream 3D Data |
| rd3x | Reflection Desktop Session Data |
| rd4 | Ray Dream 3D v4 Graphics Data |
| rd4a | Ray Dream 3D v4 Animation |
| rd5x | Reflection Desktop Session Data |
| rda | Oracle Database Storage Area |
| Ready Ace accounting data |
| Siemens MR Spectroscopy ASCII Data |
| rdat | RNA Data |
| rdb | Netscape Communicator AIM Data |
| OpenOffice.org Types Description Database |
| Oracle Database Root |
| ProModel Binary Output Database |
| Redis Database |
| Retrospect Backup Set |
| Val Nav Database |
| rdbx | RiScan Pro Point Cloud Data |
| rdc | CYANA Residual Dipolar Coupling Restraint File |
| rdd | IBM Informix Genero Studio Data Schema |
| ReliaSoft ALTA RDD Data |
| rdf | Burli Newsroom System Data |
| Chromeleon Report Definition |
| ICRA Site Label Data |
| Oracle Database Report Binary Source |
| Reaction Data File |
| ReDIF Template |
| rdg | SVAL Ridge Data |
| rdh | Siemens MR Spectroscopy Header Data |
| rdi | SPEFO Differential Spectrum Data |
| rdic | StarDict Dictionary Resource |
| rdj | JCanyon Texture Data |
| rdl | Bentley MicroStation Redline Data |
| Symbian OS Recogniser Library |
| rdm | Remote Desktop Manager Session Data |
| rdmj | Remote Desktop Manager Report Settings Data |
| Remote Desktop Manager Session Data |
| rdml | Real-time PCR Data Markup Language Data |
| rdn | Carlson 2016 Road Network Data |
| rdo | Oracle Database Redo Log |
| rdox | Reflection Desktop Session Data |
| rdr | Dynamic Report Decoder File |
| Remote Desktop Manager Report Settings Data |
| rds | Microsoft SQL Server Reporting Data Source |
| WAsP v4 Roughness Description |
| rdt | Adobe Captivate RoboDemo Template |
| ProModel Binary Output Time Series Data |
| rdvxz | RedVox Infrasound Recorder Data |
| rdx | Borland Reflex Data File |
| rdy | Ready Pro Accounting Data |
| TSP-INet Server Acknowledge Data |
| TSP-INet Server Data |
| rdz | Mandrake Linux Install Data |
| RemoteDocs Encrypted Document |
| re1 | Hy-Tek Meet Manager Registration Data |
| re2 | NEK5000 Re2file |
| re3 | Honeywell HNDR-S4824 Backup Data |
| re4 | RomEditor4 Binary Data |
| rea | NEK5000 Reafile |
| readyboot | ReadyBoot Data |
| real | Gnome Desktop Data |
| realdownload | RealDownload Unfinished Download |
| reality | RealityKit 3D Scene |
| realm | MongoDB Realm Database |
| reals | ScadaWorks Real Bank Template |
| reapeaks | REAPER Media Peak Information |
| reapindex | REAPER Media Peak Index |
| reason | Reason Data |
| reb | Reimbursement Tracker Data |
| rec | ARCserve Archivation Protocol Data |
| Easy CD Creator Recovery Data |
| eJuice Me Up Recipe |
| Epidata Data File |
| fsck Recovery Data |
| Medlin Payroll Software Bank Reconciliation Data |
| Payroll Mate Bank Reconciliation Data |
| ProMash Recipe Data |
