Modifying file hex values

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http://www.daniweb.com – Hey Guys I am working on an app which requires the modification of hex values of files. I have two questions: 1. Does anyone know where I can find a list of hex file markers E.g. each segament in a JPEG file starts with 0xFF followed by a byte indicating the type of marker. So 0FFD8 is the beginning of a JPEG image. 2. I have noticed that whenever I modify some files like RIFF, when I run then they need to be 'repaired' (in VLC player) before they can be run. Anyone know why this happens and how I can overcome this problem ? (General)