How to release it without ending the program
File Explorer is holding it. Turn off the Preview pane (Alt+P) and move to another folder — that alone usually releases it. If you end it, the taskbar disappears for a moment and comes back.
If that still does not work
- Close the program and delete
- Unlock and delete
- Move to Recycle Bin
- Delete after restart
Get LetGoFile and drop the file on it — it names what is holding the file, PID and all.