Depends on where the file is located,if the file is located on your computer use the solution I attached.Otherwise I cant help.To be easier to use I made a batch file.Safe to use and you can see the source code.No delete ,copy , move , rename commads.@rem commands display each code line scope as a commentary
Note:If you have it on a usb but you can still copy/move them move them in your computer and begin unlock process.Just make sure the Batch is in the same folder with the locked ones to detect them
If dont know how to view source code just open it with notepad