There is some sloppiness in the article:
Referencing Word for a dark theme and changing the documentatio color refers to: C:Users[YOURID]AppDataRoamingMicrosoftTemplates.
Where's the backslashes? a quick cut-and-paste will result in an error for those who don't realize they're missing. While on the subject of Word, this help only seems to apply to Office365, a monthly subscription service based Office product. Not everybody WANTS to pay a monthly fee for the product, especially when older versions work just fine. (Also we have less to worry about in the potential of MS feeding themselves "telemetry" via Office365.)
Oddly, Notepad++ seems to default to a non-dark theme (light background, dark text), at least everytime I've installed it... Yeah, you can switch it to a dark theme of your choice, but if you have any custom Language definitions, be prepared to work on changing them to keep a dark theme.