What is a .QDAT file?
The .QDAT file is a type of file specifically used by QuickTime, which is a program made by Apple for playing videos. This file contains important information needed to install QuickTime on a computer. Although QuickTime is an Apple product, you can find these .QDAT files on computers that run Windows too. Usually, on Windows, this file is called QuickTimeInstallCache.qdat and it comes together with another file that ends in .EXE, which is the actual installer for QuickTime.
To open a .QDAT file, you need to use the Apple QuickTime program. This is because the .QDAT file is designed to work with QuickTime and contains data that QuickTime understands and uses during its installation process. So, if you come across a .QDAT file, it's mainly there to help set up QuickTime on your computer, and the best way to "open" it is by running the QuickTime installer that it's associated with.
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