I could not find any clean way to solve this issue. I am still sharing the only way I found to be able to keep using Git Extensions... So I tried to reinstall GitExtensions 2.44 but this did not change anything.
However, when trying to re-install the older 2.43 version, contrary to the installer of 2.44, a conflict with the process "explorer.exe" was found and after the second attempt, the installation of version 2.43 solved my issue. I then re-installed version 2.44... Certainly not "clean" but it works.
Alain