Will corrupt if you open with POI and save a new copy.
hyperlink.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet), 29.58 KB, created by Trey Hyde on 2010-11-05 18:13:54 UTC
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Creator: Trey Hyde
Created: 2010-11-05 18:13:54 UTC
Size: 29.58 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet) is not one that your browser is able to display.

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Attachments on bug 50154: 26263