@GreenRoc If you are on KDE Plasma, alt + enter will bring up krunner. Type "explorer" and it should get you there. (You'll see whatever web browsers you have installed, and then one that looks like file explorer's icon)
I just checked on mine, typing "paint" in to krunner had similar results - showing a few programs that would serve the purpose of MS Paint.
Delightfully, if you don't have one of the results installed, it'll say "Get [program name]", which will bring you there.