http://www.pspad.com/en/download.php
Install pspad, than you can hex edit every file by right clicking on it and selecting PSPad HEX -
http://oddworld.modifikace.com/ddcheat/hex.jpg
You can hex edit AE and for example translate most of texts into different language - I have translated exoddus into Czech -
http://oddworld.modifikace.com/czech/