Maybe I'm reading something into this that is not really there, but I think you are opening Access and not your file. Maybe it's defaulting to a template, but I can't say if that's an option or not. You said you entered data, and here's my problem with the conclusions so far. When you create a db from scratch or from a template you have to give the file a name (save) before you can even begin - so it exists before you can even start. Then, to create or modify a table, you have to save it before you can enter data - so it exists. If you close the db at this point there will be no prompt since there's nothing to save, and that table will be there upon reopening.
Since you entered data directly into tables, you cannot do this without saving the row when you move onto the next - it happens automatically. If you don't move on to the next row, a decision is forced upon you if you try to close. Even if you add a record to a table and move off of the row, then close the db, there is no prompt and that record is there when you reopen.
IMHO, I think you need to look for your file, or scrutinize the Access screen when it opens, for the option to reload your file or to go and find it. That you could enter data and lose the entire file because you didn't do a save makes no sense. The only thing you could have lost is one record, or a design change if you responded no to a prompt.
Last edited by Micron; 12-18-2016 at 06:01 PM.
Reason: clarification
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.