Attachment #31448
An example of XLS file to help you reproduce a bug application/vnd.ms-excel 2014-03-27 17:02:17 UTC 23.50 KB no flags Details

Attachment cannot be viewed because its MIME type is not text/*, image/*, or application/vnd.mozilla.*. Download the attachment instead.

Attachment #32143
Here is a file can verify this problem application/vnd.ms-excel 2014-10-24 17:46:57 UTC 23.00 KB no flags Details

Attachment cannot be viewed because its MIME type is not text/*, image/*, or application/vnd.mozilla.*. Download the attachment instead.