It would appear that File OPtions was used to auto-enter the account name and password.
You can hold down the option key (mac) or shift key (windows) while opening the file and it will ask you for the password so that you can log in as admin.
Then you can go to file Options and change this setting back to what it should be.
Exactly the right answer! A useful trick to know. Thanks again, PhilModJunk.