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Add-ins
 

Book cover This article is an excerpt from Excel 2007 VBA: Programmer's Reference by John Green, Stephen Bullen, Rob Bovey, and Michael Alexander. Visit Wrox.com to learn more about this book.



In Excel 2007, an add-in workbook is a file that has been saved in a special format (.xlam file name extension) so that when it is opened in Excel, it remains hidden from users. It can contain VBA code and macros that can be accessed by other open workbooks.

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