Notes about the QTK file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The QTK file type is primarily associated with 'Apple' by Apple Inc.. (PICT variant created by Quicktake 100/150 camera. QuickTime player needs QuickTake driver to show.)