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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .Q2 | Nullsoft | Audio Files | Winamp Equalizer Auto-Load Presets File | Nullsoft Winamp | Nullsoft |
| .QAM | Omnis Software | Audio Files | Omnis Studio Audio Data | Omnis Studio | Omnis Software |
| .QCP | Qualcomm | Audio Files | PureVoice Audio File | QCP Converter | D.R. Software |
| .QSD | Quicken | Audio Files | Quicken Data | Intuit Quicken | Quicken |
| .QSF | Qualtrics | Audio Files | Qualtrics Survey File | Qualtrics Survey Solutions (online) | Qualtrics |
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