Unable to restore sql bak file to database

1

Using sql 2008 r2 std edition with sp3. we had issue with our server, had to recover all files , after we lost them a month ago, it found 300 backup files, using gteh latest bak file, tried to trestore getting the below error. is there a repair tool for backup file to fix if bak up file is corrupted?
thanks a lot for the helpful info.

Msg 3241, Level 16, State 0, Line 2
The media family on device 'C:\netorddb\netord_backup.bak' is incorrectly formed. SQL Server cannot process this media family.
Msg 3013, Level 16, State 1, Line 2
RESTORE DATABASE is terminating abnormally.

2

Where was the .bak stored at and how did you get it over to the sql server?
Did you copy it to your server and trying to restore it there? Or are you restoring from another network location?

4

It looks as though the file is corrupted. Try one of the previous .bak files.

6

Was the backup made from native SQL Server? I've had problems when trying to restore a backup that was generated by a third-party tool. That may or may not apply to your case.