As for appdata... There's many faults to find in modern Windows changes, but I'm not willing to pin this on MS. Microsoft stuff tends to use %appdata% fairly sensibly, in most cases. On the other hand, the behavior of third-party developers has been really frustrating. What was initially intended as a universal storage location for some program data has become some kind of program container. Now, whenever you download some giant 300-500mb Electron app or whatever, you can be sure that it will force its entirety into appdata with no way to change the location. Every one of these developers has decided that their program is so valuable and Important that it's inconceivable that the user might want to install it on anything but the system drive. No, our program is unique and deserves nothing but the best!