why is it that under Windows 10 this is not a problem?

Maybe Microsoft changed that part of the operating system between Win10 and Win11. Or maybe you have unknowingly mapped the network drive both under normal user and admin user on your old Win10 machine.

Thank so much for your very swift reply.

I understand what you are saying… but, although it might be true what you are saying, why is it that under Windows 10 this is not a problem?

Cannot open text files in Adminitrative mode from network shares in Win11

That’s because in Administrative mode, the Admin user isn’t logged into the network share: your normal user is the one logged into the network share. It’s a “feature” of Windows. Notepad++ cannot help you if the operating system doesn’t think the Admin User has access to your mapped network share. (I don’t honestly remember if you can have Windows log you into a network share both from the normal user and from the as-Admin mode. Maybe if you use an as-Admin cmd.exe window and replicate the NET USE command from the administrator, it would allow it; but I don’t have access to a networked environment like that where I can test it. And that’s really a Windows OS question, not Notepad++ specific question.)

I installed Notepad++ and made it startup as Administrator by default… no problem you would think.

Since there’s rarely a good reason to run Notepad++ in Administrator mode, just run in normal mode: since v8.8.6 from Oct of last year, Notepad++ can edit protected files just fine – it will just ask for UAC whenever you try to save; this will prevent having to exit out of normal mode and rerun as Admin and vice versa, every time you switch mode.