I downloaded a backup database to associate with my local copy of a website. It had an extension of .Bak and I made it .Mdf but still cannot seem to open it or access it with SQL Express. The file system sees it as a MS SQL database. Am I missing something? Thanks!
The .bak file is a backup file with contains your data files (.mdf) and log transactions (.ldf).
You need to restore the .bak file - see here
Restore .bak file via SQL Server Management Studio
- Within object explorer right click on the Databases
- Select Restore database from context menu
- Specify To Database
- Specify Source for restoring from the device
- Select Backup File
- Click the Add button and browse to the location of the BAK file
RESTORE DATABASE MyDatabase FROM DISK='c:\backups\MyDataBase1.bak'