Trying to change mime type of AVI files

I've been combing through forum messages trying to find the solution to embedded AVI files not playing in Firefox and after I reinstalled Quicktime and Windows Media Player I decided to try and mess with the mime type settings to see if that would work. So, I went into the Mime Types module, deleted the x-msvideo/avi entry, and add avi to the video/quicktime entry. However, when I refresh the page with the video in it and look at the source code the type is still set to video/x-msvideo. I've tried deleting the browser cache, and all cache's available in the Maintenance module with no effect. Why doesn't the page Gallery generates have the new mime type in the embed tag?

Gallery version = 2.1.1 core 1.1.0.1
PHP version = 4.4.2 apache2handler
Webserver = Apache/2.0.55 (Unix) mod_ssl/2.0.55 OpenSSL/0.9.7i PHP/4.4.2
Database = mysql 4.1.18-standard, lock.system=flock
Toolkits = ArchiveUpload, Exif, Ffmpeg, ImageMagick, SquareThumb, NetPBM, Thumbnail, Gd
Acceleration = none, none
Operating system = Linux vail.kobrien.net 2.4.32 #1 Thu Mar 30 07:21:19 PST 2006 i686
Default theme = matrix
Locale = en_US
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2

-=Kevin=-
http://www.kobrien.net