QuickTime installer cache
File type: Temporary file
The .qdat file extension identifies an installer-cache file associated with Apple QuickTime for Windows. It stores cached data for the QuickTime installation process, rather than playable audio or video.
Found 2 different file type records with the same qdat filename suffix.
File type category:
Temporary file
Date updated: November 10, 2026
Apple QuickTime was Apple's multimedia framework for Microsoft Windows and macOS. A qdat file is associated with the QuickTime for Windows installer, not with a QuickTime media project or playable media.
The file stores installer cache data used during installation. QuickTime for Windows is no longer supported by Apple.
A qdat file is not meant to be opened manually. It is used by the QuickTime installer on Windows, and ordinary media players or text editors will not display it as useful content.
A qdat file contains installer cache data, not media or a document, so it has no meaningful conversion to another format.
Software apps that create qdat files:
Microsoft Windows
Software applications that handle other tasks involving qdat files:
Microsoft Windows
File type category:
Miscellaneous file
Date updated: September 22, 2026
The qdat file format is associated with KaleidaGraph by Synergy Software. A qdat file contains the tabular data used in a KaleidaGraph worksheet, including data that can be analyzed and plotted.
KaleidaGraph is available for Apple macOS, including the older Mac OS X platform. The qdat format is a native KaleidaGraph data format rather than a general-purpose spreadsheet format.
Open the qdat file in KaleidaGraph on Apple macOS. Use KaleidaGraph's Open command and select the file; the application should load the worksheet data for viewing and analysis.
Other applications may not interpret the native qdat structure correctly, so a compatible version of KaleidaGraph is normally required.
Open the qdat file in KaleidaGraph and export or save its worksheet data in a text-based format supported by the installed version, such as a tab-delimited data file. The exported data can then be imported into a spreadsheet or another analysis application.
Converting the qdat file outside KaleidaGraph may lose KaleidaGraph-specific worksheet information, calculations, or analysis settings.
Software applications that handle other tasks involving qdat files:
Apple macOS / Mac OS X
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