This message sometimes pops up for no reason at all:
D:\ This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.
It has started happening since I installed Windows 10. It happens randomly, but never when I am trying to open anything. Today, for example, I was just doing some work in Excel. Does anyone know why this happens?