Question: How can I find the GUID of an MSI package? I would like to script the removal of a program on a large number of desktops by using: 

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> msiexec.exe /x *ProductCode*
> 
> 
> 

Any reason why this would not work for any applications listed in "Add/Remove Programs?"

Answer: 
A light-weight freeware tool like [InstEd](http://www.instedit.com) can be used. Just open the MSI, on the "Tables" tab, click on "Property" on the left, then on the right, locate "ProductCode".
[Revision Number Summary Property](http://msdn.microsoft.com/en-us/library/aa371255%28VS.85%29.aspx):

> 
> [T]he Revision Number Summary property
>  lists the product code GUIDs [...]
> 
> 
>