Of course, since MS Windows doesn't have emacs daemon processes one needs to keep the emacs window open in order for it to be used to open more files in the future.
In other words, I spent a ton of time to set up emacs so that when it's already open new files will be opened in that already running instance.
On the one hand it was kinda fun to fiddle with and I was happy when it was done. On the other hand I spent a ton of time getting something to work that most other editors do automatically out of the box.
In a way that kinda sums up my experience with emacs - fun to fiddle with, but takes a lot of time to set anything up.
That said, org mode is awesome, and like single-handedly keeps me using emacs :)