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Message: [QUOTE="Allan D, post: 2668344"] Hi Rafael. I get (i think) the same error: A first chance exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll The Message in the Exception is: "This file was created in a previous beta version of Excel 2007. Open the file with Excel 2007 to save it to the most recent version of the Excel 2007 file format before opening the file in Access 2007." I happens when i try to open the connection Using conn As OleDbConnection = New OleDbConnection(connStr) conn.Open() ... My connection string is: 'Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Myfile.xlsb;Extended Properties="Excel 12.0;HDR=NO;IMEX=1";' I compile to .NET Framework 3.5 with MS Visual Studio 2008 SP1 I have never had any Beate versions of Office 2007 installed. Only Office 2007 Pro Sp1 plus all what comes from Windows Update. Earlier i had MS Office 2000 Pro but then updated it to Office 2007 Pro. Best Regards Allan D [/QUOTE]