Sous Windows, trouver quel processus bloque l'accès à un fichier, sans installation d'outil supplémentaire.

    Open Resource Monitor, which can be found by searching for resmon.exe in the start menu, or as a button on the Performance tab in your Task Manager
    Use the search field in the Associated Handles section on the CPU tab Pointed at by blue arrow in screen shot below

In case it's not obvious, when you've found the handle, you can identify the process by looking at the Image and/or PID column.

You can then close the application if you are able to do that, or just right-click the row and you'll get the option of killing the process right there. Easy peasy!