Импорт/экспорт списка из бинарного файла с возможным расширением - C (СИ)

typedef unsigned long int price;
typedef unsigned char byte;
 
typedef struct
{
    char Name[PRODUCT_NAME_SIZE +1];
    char UnitName[UNIT_NAME_SIZE +1];
    price Price;
    byte Properties;
    //char newField[30];
} Product;
 
void printProd(Product *prod)
{
    printf("%s (%s) %d :::: %d\n",
    //new: %s\n", 
    prod -> Name, prod->UnitName, prod->Price, prod->Properties/*, prod -> newField*/);
}
 
int main(int argc, char *argv[]) {
    Product prod1 = {.Name = "CocaCola", .UnitName = "OZ", .Price = 250, .Properties = 15/*, .newField = "newField1"*/};
    Product prod2 = {.Name = "Snikers", .UnitName = "Pack", .Price = 75, .Properties = 13/*, .newField = "newField2"*/};
    Product prod3;
    int size;
    FILE *file = fopen(PATH, "wb+");
    if (file == NULL)
    {
        printf("no such file \n");
        return 1;
    }
    size = fwrite(&prod1, sizeof(Product), 1, file);
    size = fwrite(&prod2, sizeof(Product), 1, file);    
    if (size > 0) printf("write successeded\n");
    
    fseek(file, 0, SEEK_SET);
    fread(&prod3, sizeof(Product), 1, file);
    printProd(&prod3);
    fread(&prod3, sizeof(Product), 1, file);
    printProd(&prod3);  
    fclose(file);
    return 0;
}