Open the Recent Apps menu. Locate the app you want to close. Swipe the app card upward or to the side (varies by device). The ...

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 ...

This quick tweak can significantly improve the speed and responsiveness on almost any device - no matter the brand.