BIEW (Binary vIEW) is a free, portable, advanced file viewer with built-in editor for binary, hexadecimal and disassembler modes. It contains a highlight Java/AVR/PentiumIV/Athlon-64 disassembler, full preview of MZ, NE, PE, LE, LX, DOS.SYS, NLM, ELF, a.out, arch, coff32, PharLap, rdoff executable formats, a code guider, and lot of other features, making it invaluable for examining binary code.