I’d make a different recommendation. If you want it on Windows, make the best Windows app you can. Take advantage of all the APIs and features the platform has to offer. If you do a good job, you will make something faster and smaller that follows the platform conventions and is comfortable to use by other people like you.
Right now I think the Mac has the healthiest ecosystem of interesting software from small developers. I’m excluding games - Windows and the three big consoles rule the games space. For personal software (like the titles you mentioned) Windows feels like it’s fading and Linux is doing what Linux has always done.
Exactly what you've described is already out there: https://www.atticus.io/ (released last year - I have no affiliation.)
- who is it?
- Opportunity
If you know how to program validated business ideas just fell into your lap.
Make a Windows clone of DevonThink or Vellum.
Better yet, make a Scrivener, DevonThink or Vellum clone as a web app. The technology is more than capable.
But you won't do it.
Your parents didn't have emerald mine so you couldn't possibly be successful.
Also, Survivorship Bias!