Hello, Sheree!
If you think the "DB file" may be some kind of backup of your work, it can be worth a try to open it as plain text! To do so, find the concerning file, right click it, select open with, select program, and choose an editor e.g. under the path %systemroot%\notepad.exe (just copy and paste this path in your file browser's path bar).
I just want to point out that my user interface is not English so I am not certain if these are the correct terms, you will have to find the correct options on your own.
let me know if this worked