I had endless problems finding an answer to this question when trying to make a backup of my existing settings before making wild modifications that I wanted to test.
I finally have an answer that I'd like to share with the denizens of stack overflow in case anybody else is having the same problem!
The value is stored in the windows registry in a really unintuitive place.
HKLM > Software > Wow6432Node > Apache Software Foundation > Procrun 2.0 > [Your Instance Name]
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