root access - How can I run an installed system application that doesn't appear in the app list?

I have a rooted Android device and have a couple of pre-installed System apps in the /System/App folder that do not show up in the normal App list.

Using various file explorers, I can "look inside" the APK files or view and change information on them, but if I try to open them, I'm prompted to install the app which then gives me a warning that it will replace the existing app and it's settings. This leads me to believe these apps are already installed and functional.

Is there a way I can just run these apps instead?

I do not want to Install, Replace, Move, or Remove anything which is all I can find via Google. I just want to run the existing pre-installed app that has no icon in the app list.

As a side note, I tried using ES Explorer and created a shortcut on desktop to one of these APK files, but opening it from the desktop shortcut just prompts me with the same Install and warning about replacing the app.