Support to SQL Server 2000 from Visual Studio 2013(SQL Server 2012)?
Are these backup files from SQL Server 2000?  If so, you really should try to get these converted to SQL Server 2008/2012 formats.  A blog post from Ahmed Ibrahim walks through a set of scripts that you can run in SQL Server 2008 or 2012 that will allow you to restore these backups into 2008/2012 and convert them.  This will allow you to access easily from VS2012/2013.