Sorry, I tried your program and... access denied ! My lock screen is now grey and I can't fix that... Please help me ! :-( Sorry for my English, I'm french...
Oh, after research, I found the solution : - Select a picture - Don't apply now then go to Advanced tab - Uncheck all options - Apply - Lock your PC and enjoy your new login background Thank you so much for your work ! Congratulations !
I think I'm going to reinstall Windows because I have some things that I want to have deleted and fix the login problem
One option that might work is to use takeownership and icalcs to give you back permissions...I dont know his source code but it is probably locked down to keep M$ from changing it back to default. Just a guess but it is worth a shot.