This goes over Removing Microsoft Edge Chromium edition and keeping it removed.

The Problem

Microsoft Edge has taken over PDF viewer, and other default web tasks. Even when manually removing it will reinstall via windows updates.

Removing the Base Install

We first need to find the Edge install of the chromium edition in your Program Files.

Location:

C:\Program Files (x86)\Microsoft\Edge\Application\

The setup program is what we need to uninstall edge. Go to the location above and drill down from the number and Install folder

Example:

C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.62\Installer

Once you find your path you can now uninstall edge with the following command (Note: YOURS WILL BE DIFFERENT!)

C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.62\Installer\setup.exe --uninstall --system-level --verbose-logging --force-uninstall

Keep it from coming back… for now

You now need to add a registry entry. The following location Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EdgeUpdate needs to be added with a DWORD called DoNotUpdateToEdgeWithChromium with a value of 1.

You can do this with a simply reg file. (stopedge.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EdgeUpdate]
"DoNotUpdateToEdgeWithChromium"=dword:00000001

Create this file or download the file @ https://christitus.com/files/stopedge.zip

Run this to prevent edge reinstallation. Note: Microsoft will kill this workaround in the future and force edge on you