Windows – Use GitHub’s Atom Text Editor as Default Text Editor in Windows

I think the title says it all. I downloaded Atom, which comes over as a zip file containing an executable, etc. When I right-click on a text file, source code file, etc, in Windows Explorer and select Open With > Choose default program… I don't see Atom in the list of "Recommended Programs" or "Other Programs" (when I use the arrow to expand that list). If I select "Browse" and use the file explorer to navigate to the Atom executable file and select that, when I return to the "Open with" dialog, I still do not see Atom as an option. I'm pretty clueless when it comes to Windows, so if anyone has any suggestions I'd really appreciate them – thanks!