Well, I just re-installed OpenJK and the game runs without bug, although it didn't before. I prefer to not trying to understand. Even with old saves and mods/maps, no problem at all.
But first of all, I want to thank you VERY, VERY, VERY MUCH for the time you gave in this thread (4 pages!), trying to find a solution and other ways. You were very patient without leaving, it was really nice! Well, it doesn't fix the bug with MOH but it is not as important as JKA (mods, maps and all in this SW game).
I mark the topic solved for me. Hope it will work with my friend's games.
lang_french's post in JKA doesn't work on W10 was marked as the answer