The reason why the name format change from 11/22/63 to 11.22.63 is because under the current Windows naming protocol, "11/22/63" is an invalid format for saving a file, while 11.22.63 is not.
The reason why the name format change from 11/22/63 to 11.22.63 is because under the current Windows naming protocol, "11/22/63" is an invalid format for saving a file, while 11.22.63 is not.