PSD cffile accepts / MIME issue

I would like my member to be able to upload various image file formats
including jpg/jpeg, gif, png, bmp, and psd. I know that the jpg/jpeg works
fine since I uploaded a few ones, but when I went to upload a PSD, I got an
error telling me that I could not do that type of file. I have the cffile
set to:

<cffile accept="image/gif, image/jpeg, image/jpg, image/png, image/psd"...

What am I doing wrong and what is the proper MIME type to accept PSDs

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Wally Kolcz
Developer / Support