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This issue came up in a discussion by some Drupal developers (http://drupal.org/node/939962). We would like to let non-technical users specify acceptable (or non-acceptable) files for a form field by entering a list of file extensions. It is our belief that requiring MIME types like application/vnd.openxmlformats-officedocument.wordprocessingml.document in order to allow a .docx file is not practical and is too technical for the layman. On the other hand it is equally impractical for us to keep an accurate mapping of extension to MIME type within our code because those types change and new types are added with some frequency. As a matter of practicality this should be added to the HTML spec so that the "accept" attribute is useful. ---- If this is not the correct place to bring up this issue please let me know where I should go... Thanks!
*** This bug has been marked as a duplicate of bug 11482 ***