| qcif | CIF RAW Video File |
| qlv | Tencent QLV Video |
| qmx | Quantum Streaming Video Stream Control Data |
| qqq | TotalFix Fixed AVI Video |
| qt | QuickTime Movie |
| qtm | QuickTime Movie |
| qtz | Quartz Composer Composition |
| ravi | Optiris PI Radiometric Video Sequences |
| rcrec | LogMeIn Pro Remote Control Session Recording |
| rdg | Morae Recorded Video |
| rf | RealFlash Clip |
| rm | RealMedia File |
| rmd | REDCODE Metadata |
| rmf | RealMedia File |
| rmhd | RealMedia HD Video |
| rms | Secured RealMedia File |
| rmv | RealMedia Variable Bitrate Video |
| rmvb | RealMedia Variable Bitrate Video |
| rpl | ARMovie Replay |
| rsx | REDCODE Metadata XML |
| rtv | NewTek Uncompressed Video |
| rum | Bink Video Subtitle File |
| rv | Real Video Movie |
| rv8 | Real Video Movie |
| rv9 | Real Video Movie |
| rvid | Snapz Pro X Recorded Video |
| rvx | RealVideo Protected |
| s1m | Sealed MPEG Movie |
| s1q | Sealed QuickTime Movie |
| sbm | Stream Bean Media |
| sbt | SBT Subtitle |
| sbv | SubViewer Subtitle Format File |
| scc | Sonic Scenarist Closed Caption File |
| scke | SpyClock Encrypted Video |
| scm | ScreenCam Movie File |