if (main->versionfile < 267 || (main->versionfile == 266 && main->subversionfile < 5)) {
    Object *ob;
    for (ob = main->object.first; ob; ob = ob->id.next) {
        ParticleSystem *psys;
        for (psys = ob->particlesystem.first; psys; psys = psys->next) {
            ParticleSettings *part = psys->part;
            printf("%d",part->omat);
        }
    }
}