This is a good site that shows hundreds / thousands of different computer data formats that are used with all differnet types of files. Including image files, text files and formats, etc. If you need to find what a file extension means and what the dteilas for the file format are then this a great web site for you. - Read more

Wotsit is the programmer's file and data resource. They have vast collection of programming resources with detailed file formats and information. - Read more