Dragging them from the Start Menu to a toolbar (in Customize mode) will get the IDL to launch the app.
I'm not sure if there's a way to send files to it via that, though.
There's also an AppX(long random numbers) class ID for most of those apps which can be used with the FileType command, and which can often be used to send files to things. Those can often be found in the registry, or via the manifest XML files in the app folders (which you can list from an elevated command prompt, and the folders themselves can be browsed in Opus once you know their paths; it's just the WindowsApps folder itself which is inexplicably permissioned to block you from listing it, due to Microsoft's continuing and worsening insanity).
But it's much easier to just use a proper piece of software that is installed normally and not obfuscated by this garbage.