It's located in the "data" folder. However, that's not the cause of the CTD.
And no, I didn't corrected it. You should double check.
In the battle_models.modeldb file located in the unit_models subfolder in the data folder, for Italian_Cavalry_Militia, you have originally:
Code:
5 slave
68 unit_models/sandy_units/AttachmentSets/gs_attachments_slave.texture
68 unit_models/sandy_units/AttachmentSets/gs_attachments_normal.texture 0
Replace the "68" in red by "67". You should get:
Code:
5 slave
67 unit_models/sandy_units/AttachmentSets/gs_attachments_slave.texture
68 unit_models/sandy_units/AttachmentSets/gs_attachments_normal.texture 0