if err != nil {
			return nil, fmt.Errorf("error reading Mach-O file %s: %v", name, err)
		}
		return f, nil
	}
	if machoMagicLittle == macho.MagicFat || machoMagicBig == macho.MagicFat {
		f, err := b.openFatMachO(name, start, limit, offset)
		if err != nil {
			return nil, fmt.Errorf("error reading fat Mach-O file %s: %v", name, err)
		}
		return f, nil
	}

	peMagic := string(header[:2])
	if peMagic == "MZ" {