I run Registry Finder to find a recently modified and search for the specific key that I'm looking for.

When it's found, I see the last modified time but I don't see a way to tell what process modified the key. Is that an option somewhere that I can enable?

Version is 4.0.0.1499

9 days later

Unfortunately Windows does not provide such feature, it tells us only the last modification date but nothing more in regards what software modified the specific registry key.