File Upload Content type for .docx

Hi all,

I'm using the FileUpload control for uploading MS Word and MS PowerPoint
documents.

To check if a user uploads a correct document, I check the contenttype
(FileUpload1.PostedFile.ContentType) of each document, "application/msword"
for MS Word and "application/vnd.ms-powerpoint" for MS PowerPoint.

When moving to the new Office2007 file-formats, DOCX and PPTX, the
contenttype is "application/x-zip-compressed" for both DOCX as PPTX.

Now, I could treat the uploaded document as ZIP-file and check on the
<Application> element in the "app.xml" in the subdir "docProps" in the ZIP
but isn't there an easier way to accomplish the correct MIME content type?

regards
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