ntuser.dat to ntuser.man
I have mandatory profiles which are pulled from \\<server>\netlogon
The "Default User" profile contains ntuser.dat
Lockdown policies prevent the students from making changes on the local workstations so do I still need to rename ntuser.dat to ntuser.man?
No we did exactly the same until recently. As that's the location on the domain default profile any domain computer will pick that up. Delete them at bootup and lockdown with GP (as you are doing) and you'll have no issues.