Looks good! A couple questions:
> Right-click OldExplorer.exe, select Properties, check Unblock, and click OK.
I don't see that checkbox; not sure if it matters.
And what does the "Compatibility" tab option in Properties mean
"Register this program for restart"?
With most browsers, when you download to an NTFS volume, the executable files will be marked as "blocked". If you don't see an unblock checkbox it could be because your browser does do that or because the file was downloaded to a non-NTFS volume. So, short answer, it doesn't matter.
The "Register this program for restart" option in Compatibility tab will appear for all exe files. It's not applicable in this case. It's something one may use for a program that needs to be running all the time in the background.