The same problem with MS PowerPoint files (application/x-zip-compressed), 41.43 KB, created by Sepp on 2012-04-06 16:23:22 UTC
Creator: Sepp
Created: 2012-04-06 16:23:22 UTC
Size: 41.43 KB

Attachment is not viewable in your browser because its MIME type (application/x-zip-compressed) is not one that your browser is able to display.

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Attachments on bug 52863: 28554