I discovered that it is easy to open the current selected Git repository with Fork through Total Commander.

1. Add a new Toolbar Button to the Total Commander Toolbar.
2. Select the Fork Executable: C:\Users\User\AppData\Local\Fork\Fork.exe
3. Parameters: “%P.”
4. Start path: C:\Users\User\AppData\Local\Fork\
5. Select Icon
6. Tooltip: Fork

Attention: Replace “User” with your own Windows Username!

Save this Button and it will be shown in the Toolbar.
Clicking the Button results in Fork being launched with the selected repository.