| ril | Android Radio Interface Library |
| riw | Lowrance Sonar Software Upgrade |
| rman | Oracle Recovery Manager Script |
| rmn | Oracle Recovery Manager Script |
| rock | Rockbox Plug-in |
| rpi | Kega Fusion Render Plug-in |
| rpj | Real Pac Batch Job |
| rpln | Adobe InDesign Required Plug-in |
| rqf | R-Quest Duplication Systems Firmware Update |
| rra | Windows Installer Temporary File |
| rsa | PKCS7 RSA Signature |
| rsj | Personal Backup Saved Task |
| rsl | Adobe PageMaker Resource |
| rsrc1 | Multiloader RSRC1 Firmware |
| rsrc2 | Multiloader RSRC2 Firmware |
| rtsp | Real Time Streaming Protocol Data |
| rwt | HyperRESEARCH Plugin |
| rwz | Microsoft Outlook Rules Wizard |
| rxc | Roxio Certificate |
| rxt | Retrospect Extension |
| s8l | SAP GUI Shortcut |
| safariextz | Apple Safari Extension Package |
| safe | SigzaLock Encrypted Data |
| save | Nano Temporary Save |
| sax | Spektrum DX8 Transmitter Firmware |
| sbf | Motorola System Firmware |
| sbh | IBM SQABasic Header |
| sbin | Cisco Router Unsigned Firmware Image |
| scap | MacBook EFI Firmware |
| scbo | MacBook EFI Unlock File |
| scexe | HP iL02 Firmware Update Data |
| scm | Gimp Script-Fu Script |
| search-ms | Windows Saved Search |
| sef | Encryptafile Signature |
| sek | Uniface License Key |
