MIME Types and [MyProgram] Cannot Open this File Type!

Never understood what the MIME type was before and that came to bite me in the ass today.  Basically we had this application that reads this file we generate from a site and it automatically opens in the browser.  Well the issue our clients were having was that the file was not recognized and the application would not open it. What changed was that the program had an update that deprecated the existing extension and instead changed it to a new one.  So after I changed the file extension to the new one I also had to change the mime type of the file to the new format so the program would open, loading the data.

http://en.wikipedia.org/wiki/MIME

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