[CentOS] file command returns incorrect MIME type?

Here's the problem:

[ben@kepler tmp]# file -i presentation.ppt presentation.ppt: application/msword

I see lots of references to this problem, (EG: IMP, PHP bug, etc) all of which conclude, in various forms, "the problem is in your /usr/share/magic.mime, go away". But nowhere (that I've been able to find) is there actually a solution - and even the magic.mime file from the latest tar (downloaded from astron.com) didn't fix it, either. The magic file in the apache directory seems to come up with the answer of: no answer. When you access a ppt in apache, it comes back with a generic response rather than "application/powerpoint"

Any ideas?

-Ben