The file which produces Unreadable content error
Output_externalLink.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet), 9.04 KB, created by Lee on 2013-04-30 06:55:11 UTC
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Creator: Lee
Created: 2013-04-30 06:55:11 UTC
Size: 9.04 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 54907: 30241 | 30242