| rec | Payroll Mate Bank Reconciliation Data |
| rec | ProMash Recipe Data |
| rec | Recogniform ICR Data File |
| rec | Windows 3.1 Macro Recorder Data |
| rech | 4D Database for Mac Search Document |
| red | CARE-S InfoWorks Rainfall Data |
| red | IBM Rational Rose Module Diagram |
| redif | ReDIF Template |
| redis | Redis Database |
| ref | Ad-Aware Signature Data |
| ref | PLINK Long-format Reference Allele File |
| ref | PTC Creo Assembly References Data |
| ref | RFSCAT Simulator Wind Field Reference Data |
| ref | WinPLOTR Refined Parameters Data |
| reference | Budget In Brief Reference Data |
| refx | E-Sword Reference Library Note Data |
| reg-auto | WOW! Diagnostic Registration Data |
| regkey | Zoom Player Registration Key Data |
| regs | Netscape Navigator Registry Data |
| regularizer | SAM Transition Regularizer Data |
| rek | Fraunhofer EZRT Volume Data |
| rel | 3DCS Simulation Related List Data |
| rel | Act! Alarm Data |
| rel | my Knowledge Relation Data |
| rel | Nintendo Wii Relocatable Module |
| rel | Norton Internet Security Log |
| rel | PLINK Text Relationship Matrix |
| rem | Act! Database Maintenance Data |
| remotecodec | Reason Remote Codec Data |
| remotemap | Reason Remote Mapping Data |
