begrudgingly using win32 api

So I'm fairly new to programming, really new to graphical, and windows programming. I've written a command line based utility for windows which loads an image and manipulates it. I have been asked to add an interactive mode.

Anotherwards when I start the program without arguments I would like to have some file loading gui launch.

I'm using opencv and I suppose I have no choice but to use windows.h
can someone point me in the right direction?
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