Using the tool is super easy. In Windows Explorer, right-click the file that’s obstinately refusing to be deleted (or in use in any other way), then click “What’s using this file?” The File Locksmith ...

Seriously, once PowerToys is installed, all you have to do is right-click on the offending file and choose "Unlock with Locksmith." Then a window pops up telling you exactly what program is locking ...