Convert DB to MDF

In case that you are looking for a way to convert various .db databases to Microsoft SQL database format (.mdf), your best bet is most likely to use some of the dedicated database conversion solutions like Full Convert Enterprise, or similar. Alternatively, you could use some middle-step format and convert first your .db file to some common exchange format which you could then import to Microsoft SQL and save in its formats, which will eventually achieve db to mdf conversion for you.