Why are QAP context menus not working in some windows?
In some setup, the QAP context menus may work well in Windows Explorer windows but not in a custom file manager. Or the opposite.
This is generally because some applications are running with different access privileges.
For example, if your file manager is running with administrator permissions while QAPmessenger.exe (that app transmitting commands from context menus to QAP) is running with standard permissions, messages sent from the context menu could not be received by QAP. Maybe you should run your file manager with regular permission or, on the opposite, launch QAPmessenger.exe with elevated privileges.
The opposite could also be true: if QAP runs in admin mode and Windows Explorer (or your custom file manager) in standard mode, context menus in Explorer could not launch QAP commands because QAP has higher permissions than Explorer. Context menu can only call apps having privileges equal or lower than Windows Explorer has.
Please read more about Why is the middle mouse button not working over some windows?.
To find more about installation and enabling of Explorer context menu, read the Explorer Context Menus Help.