QDK file extension is for Backup of startup files created by Optimize QEMM
Similar to QDK
3DM - QuickDraw 3D Metafile QuickDraw3DMF - QuickDraw 3D Metafile QuickDraw
3DS - Graphics Autodesk 3D Studio
3FX - 3D effects CorelChart
3gp - Video format compatible with mobile devices
3GR - VGA graphics driver Windows Video grabber
3T4 - Util3 Binary file converter to ASCII
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