I Think I’ve found other reference about it. I’ve delete mine on
HKEY_CLASSES_ROOT\LibraryFolder\background\shell
Based on https://stackoverflow.com/a/32490883/4906348, Quite simple, I never think about it. You should see like this.
Note
For Windows 10, there may be also keys in HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\background\shell
and/or HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell\git_shell
which you may have to delete as well.