LibCheck
This tool allows you to compare two versions of an assembly, and determine the differences. The tool reports the differences as a combination of 'removed' and 'added' APIs
path to download
http://www.microsoft.com/downloads/details.aspx?familyid=4b5b7f29-1939-4e5b-a780-70e887964165&displaylang=en
Reference: http://www.microsoft.com/downloads/details.aspx?familyid=4b5b7f29-1939-4e5b-a780-70e887964165&displaylang=en
