Airplane Erased

Hey,
does someone know how the planes are linked to a mission?
My problem: I erased a few texture of the default Bell Jetranger (stupid!) and now, though I can play the mission, don't see the shape of the helicopter.
My question: is it possible to change the texture/plane used in a mission? (Yes, I know the possibility of reparing/reinstalling a programm, but in an other way?)
Thx Meck
P.S.: please don't judge me by potential mistakes - I'm Bavarian...
does someone know how the planes are linked to a mission?
My problem: I erased a few texture of the default Bell Jetranger (stupid!) and now, though I can play the mission, don't see the shape of the helicopter.
My question: is it possible to change the texture/plane used in a mission? (Yes, I know the possibility of reparing/reinstalling a programm, but in an other way?)
Thx Meck
P.S.: please don't judge me by potential mistakes - I'm Bavarian...
