An old idea that probably no longer works today. In this sense, like Win*
The Idea is to change the button “erleichterte Bedienung” on the Login Display to run cmd.exe. Now you can change the win* user password.
sudo su
mount /dev/sda1 /mnt
cd /mnt/Windows/System32
A click on the button “erleichterte Bedienung” starts cmd.exe:
net user
net user “the username with white spaces” aaa
Restore saved Utilman.exe:
sudo su
mount /dev/sda1 /mnt
cd /mnt/Windows/System32
Be happy.