| rcd | Symantec pcAnywhere Recorded Session |
| rcf | Audiogalaxy Rhapsody Storage Data |
| rcg | Netscape Navigator RCG Data |
| rcg | Recog Character Recognition Set |
| rch | MODFLOW Recharge Package |
| rch | SWAT Reach Output Data |
| rci | SPEFO Rectified Cleaned Data |
| rcj | Robocopy Job Data |
| rck | REScheck Data |
| rcl | Reflection Command Language Script |
| rcl | RockWorks Command Language Data |
| rcm | Autodesk Reality Captured Mesh |
| rcm | Logos Library System Data |
| rcm | Technics SX-KN6000 Rhythm Custom Data |
| rcn | QRacing Track Records Data |
| rco | PlayStation Portable Resource Data |
| rco | Source Insight Crash Recovery Data |
| rcq | RESTClient Requests File |
| rcr | SAP Business One XL Reporter Data |
| rcs | RCSWin Job Script |
| rcs | Recap Single Pointcloud Scan Data |
| rcs | SaralTDS eTDS Software Annual Report |
| rctd | RabbitCT Dataset |
| rcut | Webinaria Recording Cut |
| 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 |
