Anything above 100% is considered high DPI on Windows, including 125%. I.e. if the display DPI is not 100% and the app isn't DPI aware you will end up with a blurry mess since the OS will stretch the app for you via bitmap scaling by a factor of DPI / 100%. Apple is the only one that does integer factor only DPI for their hardware (100%, 200%, 300%...) and their entire current lineup is >100% now.
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Anything above 100% is considered high DPI on Windows, including 125%. I.e. if the display DPI is not 100% and the app isn't DPI aware you will end up with a blurry mess since the OS will stretch the app for you via bitmap scaling by a factor of DPI / 100%. Apple is the only one that does integer factor only DPI for their hardware (100%, 200%, 300%...) and their entire current lineup is >100% now.