Vivien, I downloaded your file, but I can open it, because it is only the assembly file. All parts are missing.
Could you upload them?

ANSI B18.2.4.2M - M10x1,5 - 16.ipt
DIN 125-2 - B 10,5A.ipt
TDO-120-8 ZI.ipt
axe_fixation_roue_ar.ipt
axe_fusée.ipt
barre_5_U.ipt
barre_6_U.ipt
Batterie_48v_15Ah.ipt
215602-8.ipt
bride.ipt
cable_5.ipt
cable_6.ipt
chassis.iam
direction_ensemble.iam
fixation_roue_arrière.ipt
Guidon\Ensemble_guidon.iam
moteur_roue_arrière.ipt
Ordinateur_de_bord.ipt
pièce_rotule_collone.ipt
Pièce3.ipt
Pièce4.ipt
plaque_fixe_bride.ipt
plaque_sécurité_pile_hydrogène.ipt
plaque_trapèze.ipt
Raccordement_batteries.ipt
rallonge_direction.ipt
rotule1_d16_M8.ipt
rotule2_d8_D16.ipt
ASSEMBLAGE Jante ar..iam
ASSEMBLAGE Jante av..iam
fixation_siège.ipt
Support_1_batterie.ipt
Support_2_batterie.ipt

Thxanks

Here Ricardo Espinosa: Prototype Electric Car

Merci Beaucoup