21.5 Tile viewers

Assuming your file is not compressed and even if you are not looking for imagery take a look over it with a tile editor and appropriate palette. Although most of us recognise numbers instinctively we are still hardwired to look for visual cues so if you see large chunks of “blank” space you are probably not looking at text and likewise you can get an idea of patterns (header, information and then more header and more information for example). Hex editors also quite often offer to colourise the hex window/portion although this is not that ideal in many cases.