HOORAY, I finally managed to launch the "Cockpit_mod" Fightermedic thank you for all the advice you gave me, and I thank all those who helped me.
I deleted everything and reinstalled in Games \ Freespace2 and impeccable! I do not know why it did not work the first time.
Is it normal that when I select "Cockpit_mod" in the launcher it is written at the top right, there Mediavps_3612 image and name in the middle of the launcher please?
Thank you again for your help.
PS: Thanks again for your help and excuse me for the English translation with "Google Translation".
One last thing please, red triangle between the viewfinder and the target on the first screen on top (1), I guess it's the missiles lock is to make a selection in the pitcher Freespace2 or it is part of a mod which you play?