| Abbreviation | Definition |
|---|---|
| QLB | Quick library (BASIC PDS - MS C/C++) |
| QLC | ATM Type 1 fonts script ( Adobe Type Manager) |
| QLP | QuickLink Printer Driver |
| QM4 | QMail Options or services file |
| QML | Text file in standard XML format |
| QNA | Quake Name Maker Help File |
| QNM | Quake Name Maker Help File |
| QNN | Quake Name Maker Help File |
| QPD | Individual Problem Description |
| QPH | Quicken Price History |
| QPR | Generated query program (FoxPro) |
| QPR | OS/2 Print Queue device driver |
| QPX | FoxPro Compiled executable QBE query file |
| QQT | Query QuickTime Player Plug-in |
| QRK | Planet Quake files |
| QRS | Equation Editor support file (WordPerfect for Win) |
| QRT | QRT Raytracer 24bit Bitmap graphics |
| QRY | Query (dBASE IV) |
| QSN | QuickScan data (TapCIS) |
| QT | QuickTime movie (animation) |