| File Extension: | QTX |
| File Type Description: | QuickTime Extension File |
| File Type Developer: | Apple |
| Primary Associated Software: | Apple QuickTime Player |
| Primary Software Developer: | Apple |
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QuickTime Extension File files were originally developed by Apple for the Apple QuickTime Player software application. Data from our web servers (annonymous users) show that QTX files are most popular in United States and are often used by Windows 10. A vast majority of these users are opting to use Google Chrome as their preferred internet browser.
 | Apple QuickTime Player by Apple |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .QTS | Apple | System Files | QuickTime System File |
| .CONVERTER | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .MEMORY | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .RB | Larian Studios | Game Files | Divinity: Original Sin Game Data |
| .MSL | Microsoft Corporation | Developer Files | Mapping Specification Language File |
| .WIDGET | Microsoft Corporation | Executable Files | Microsoft Windows Mobile Widget |
| .ERB | Open Source | Developer Files | Ruby ERB Script |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup |
| .MP21 | AXMEDIS Products and Services | Video Files | AXMEDIS MPEG-21 Object |
| .OSMALLER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
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