Atom is uninstalled, but I still have the option to "Open with Atom" available

And when I click on it, it just shows me the dialog box to choose the default app for the file type. I know it’s a really trivial issue but I prefer not to have this kind of things bothering me. I have a tendency to misclick stuff.

What version of Atom did you have installed and what operating system are you running?

I don’t which version is it. I’m running Windows 10

I think you can delete it by yourself
It is in the Registry