Iexpress is a builtin tool in Win7 and Server 2008 for creating bundles and commands that is generated as an exe file.

Technet:

http://technet.microsoft.com/en-us/library/dd346760.aspx

Can be used with for example SCUP:

http://blogs.technet.com/b/dominikheinz/archive/2011/10/17/deploying-custom-msu-updates-with-sccm-and-scup.aspx