If you upload a file through Firefox, it may send the wrong mimetype for this file.
Delete mimeTypes.rdf, in the user \Application Data\Mozilla\Firefox\Profiles folder.
You may find it in extensions folder also.
Delete the files and restart Firefox and see if it works for you.
http://techblog.procurios.nl/k/news/view/15872/14863/Mimetype-corruption-in-Firefox.html
http://codeigniter.com/forums/viewthread/146338/
1 comment:
Actually this happens in just about every browser. IE also has a propensity to upload files as text/plain - but just restarting IE tends to resolve the issue (for awhile anyway).
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