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Reading the answer here I don't understand this 'little button' to right of open.

  1. Navigate to your C:\Windows\System32\config\RegBack, click the little button to the right of "Open" for "Show Previous Versions"

What is it? there seems to be no such thing.

I replaced my path variables while trying to work with OpenCV/CMake.

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up vote 1 down vote accepted

You can always right-click any file/folder, open its Properties dialog and click on the Previous Versions tab:


As for your specific question regarding "the little button to the right of Open for Show previous versions", he was talking about this:


Took me some time to figure it out as well; the instructions should have been clearer.

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