visual studio 2010 - The type or namespace name 'Extensions' does not exist in the namespace 'Microsoft.Office.Tools.Excel' -


visual studio 2010 vsto excel 2007 add-in project. trying build solution in visual studio following:

the type or namespace name 'extensions' not exist in namespace 'microsoft.office.tools.excel' (are missing assembly reference?) 

the project referencing following assembly: c:\program files\reference assemblies\microsoft\vsto\v9.0\microsoft.office.tools.excel.v9.0.dll

on machine assembly product version 9.0.21022.8. on other developer machines project builds assembly product version 9.0.30729.1.

what need install upgrade these assemblies v30729?

thanks, tom

apparently answer install microsoft visual studio 2008 service pack 1 (we're using vsto v3.0) - http://www.microsoft.com/downloads/en/confirmation.aspx?familyid=fbee1648-7106-44a7-9649-6d9f6d58056e&displaylang=en

this upgrade microsoft.office.tools.excel.v9.0.dll assembly product version 9.0.30729.1 includes extensions namespace.


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