Now there Debian available over the Microsoft Store on Windows 10. Very small RAM usage, much better than the ubuntu version.
Open PowerShell as Administrator and run:
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
Then Open the Microsoft Store and search for debian.
The File are now in C:\Users\%USERNAME%\AppData\Local\Packages\TheDebianProject.DebianGNULinux_*
I wonder why it is no longer in C:\Users\%USERNAME%\AppData\Local\lxss\
For having correct displayed german characters I had to change the console
sudo dpkg-reconfigure locales sudo apt install console-setup sudo dpkg-reconfigure console-setup