Hello!
I have been creating images for several years now and still have not found a suitable solution to changing the default browser for all new users from Edge to Internet Explorer. Up until Windows 10 1803 this hasn't seemed to cause a pressing need to get this changed. From what I have noticed, the Edge browser starting with 1803 causes issues with our state testing app. There are several background services that start up and prevent the testing app to run.
I have tried to accomplish this 3 different ways. I have applied a group policy that uses the xml file I exported from a computer I set all the defaults on. I have used the same xml file and applied it in an MDT task sequence using the ZTIDefaultAssociations.wsf that copies the OEMDefaultAssociations.xml file to the system32 folder as well as writes the path in registry. Both of these options have successfully changed the default browser to IE, but if you change the default to something else it is reverted back to IE every time you restart.
I have also tried using dism to load these defaults.
I need to get the default changed from Edge to Internet Explorer for every new user that logs into the computer, but allows the user to pick their own browser and have it stick.