Look at your files at Byte level with HexDump. You can even edit and save your large files.
Some of the great features of HexDump - super fast loading of files ( even GB size files) - no limit on file size ( over 150 GB tested ) - compare binary files side by side - minimal CPU / disk requirements - display text in all possible encodings (UTF-8 , ASCII , ISO-Latin , etc) - direct editing of the file in either as text or as Hex type - change display font type and size