How can I find the product GUID of an installed MSI setup?

Question

I need to find the product GUID for an installed MSI file in order to perform maintenance such as patching, <

Answer 1

There is also a very helpful GUI tool called Product Browser which appears to be made by Microsoft or at least an employee of Microsoft.

It can be found on Github here Product Browser

I personally had a very easy time locating the GUID I needed with this.