Allows the very important 'overwrite files while they're open' functionality used during update. Write all the new files for a service then restart it. No need to reboot the whole machine for that.

Looking at you, Windows, and your bullshit scheduled reboots.

Sure, that 'fixes' it. The real question is, if that information is retrievable anyways... Why is it not a built-in part of windows. You get the error popup and it should just show two buttons: "Ok and "Find which program is using it"