...single file using File History, you can do that--you don't have to restore all of them.
While you can just launch File Explorer and access the files that File History stores in its backup folder on your external drive, that is not the way that it is meant to be used.
When you use File Explorer, you will see the data and time stamp appended to the file by File History to keep track of the different versions of the backup.
When you restore a file through File History, the data and time stamp is removed from the file. So, as long as you use File History to restore files, you won't have to be concerned with renaming all of the files.