The windows file you are looking for might be under the vehshare.ytd if not you would have to contact the model creature and ask for the vehicle template to be able to edit it. also if you manage to get the textures for the windows and they are not visible or you wish to create this into a livery you need to add this line to vehicle.meta FLAG_HAS_LIVERY if its not there already. Hope this helps

OIV Packages have to be uninstalled manually for example if you install a car OIV package to uninstall it you would have to remove the line for that package from dlclist.xml and for older packages sometimes have a extratitleupdatedata.meta line that you would have to remove this would disable the dlc. To fully delete the OIV delete the dlc package (dlc.rpf for that OIV install). Hope you found this useful