When writing Salsa (an Amazon S3 client), I ran into a situation where I needed to map MIME types to file extensions and vice versa. So I wrote a simple but very handy utility to do it for me. The ActionScript code is here if you just want to copy it, or it’s available in as3corelib if you want grab the entire library (with tons of other useful APIs).
By Christian Cantrell
December 4, 2007