Not to worry here, if it’s a system based task, you won’t be able to kill it anyway.
So, for example, if you can recognize the type of file yourself (say Excel), then hunt for the locked file or process in the Task Manager window and right-click on it. This not only gives you an idea of running apps and services at any time on your computer, you can also use it to kill services that might be stopping you from deleting certain files. One great thing that I’ve always liked about Windows is the great Task Manager. Sure, it has its cons, but it’s got it pros too. I spoke about Window’s legacy for a reason. Cool Tip for Windows 10 Users: The Digital Citizen blog has an interesting post that compares browsers to see which one saves battery on Windows 10.
