Getting Error when restoring database without bak extension

Question

TITLE: Microsoft SQL Server Management Studio

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Restore failed for Server 'DESKTOP-OMAQMEO'. (Microsoft.SqlServer.SmoExtended)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=11.0.2100.60+((SQL11_RTM).120210-1846+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Restore+Server&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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The database was backed up on a server running version 12.00.2269. That version is incompatible with this server, which is running version 11.00.2100. Either restore the database on a server that supports the backup, or use a backup that is compatible with this server.

RESTORE DATABASE is terminating abnormally. (Microsoft SQL Server, Error: 3169)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=11.00.2100&EvtSrc=MSSQLServer&EvtID=3169&LinkId=20476

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BUTTONS:

OK

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