Microsoft Excel 12.0 Object Library is part of the Microsoft Office 2007
The is a specific set of definitions used for automating Excel 2007 from other applications like Access or Visual Studio. You generally cannot download this library as a standalone file from Microsoft; it is included automatically when you install the full version of Microsoft Office 2007 . How to Obtain the Library
: Unlike standard data-reading methods (like ADO), this library allows you to perform any manual task programmatically: bolding cells, moving sheets, deleting columns, and saving complex workbooks. Large Dataset Handling
If you don’t have Office 2007 at all, you have two choices:
Microsoft Excel 12.0 Object Library is part of the Microsoft Office 2007
The is a specific set of definitions used for automating Excel 2007 from other applications like Access or Visual Studio. You generally cannot download this library as a standalone file from Microsoft; it is included automatically when you install the full version of Microsoft Office 2007 . How to Obtain the Library
: Unlike standard data-reading methods (like ADO), this library allows you to perform any manual task programmatically: bolding cells, moving sheets, deleting columns, and saving complex workbooks. Large Dataset Handling
If you don’t have Office 2007 at all, you have two choices:

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