I renamed my Roms folder into a_effacer_Roms. Then I did a symlink using drag and drop with Shift+Ctrl pressed in PCManFM explorer. The created link opens the target folder and I was able to put and browse my Roms with PCMan FM on the NTFS partiton.
I wanted to refresh my Roms into Batocera's parameters menu. And the screen becames black for a long. I rebooted my computer. I started Batocera again. I seen the boot logo and the background picture and the screen is now back to black.
My install is Game Over. Fortunatelly I did a ghost of my SSD with HDClone, so I'm safe. It doesn't matter. I'll try to remove the link with a Linux Boot CD.