| qda | Quadruple D Archive |
| qdz | Altera Quartus II Device Package |
| qfc | QFC Archive |
| qic | Windows 95/98/ME Backup |
| qlz | QPress QuickLZ Compressed Archive |
| qp | QPress QuickLZ Compressed Archive |
| qp03 | QPress QuickLZ Compressed Archive |
| qpk | QNX Package File |
| qpkg | QNAP QTS Package |
| qq | Shrinkit BLU Archive |
| qqa | Quanquest Archive Data |
| qsb | Lenovo Smartphone Firmware Update |
| qta | Tape Archive |
| qtar | Tape Archive |
| qtsk | Qtracker PlayerWatch Skin Package |
| quad | QUAD Compressed Archive |
| quicklz | QPress QuickLZ Compressed Archive |
| qup | QuickTime Update Package |
| qze | QZip Encrypted Archive |
| r0 | WinRAR Compressed Archive |
| r00 | WinRAR Archive |
| r01 | WinRAR Archive |
| r02 | WinRAR Archive |
| r03 | WinRAR Archive |
| r04 | WinRAR Archive |
| r05 | WinRAR Archive |
| r06 | WinRAR Archive |
| r07 | WinRAR Archive |
| r08 | WinRAR Archive |
| r09 | WinRAR Archive |
