excel contains an image,you need to export this to pdf and compare the exported image
big-image.xlsx (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet), 67.73 KB, created by ankit on 2014-11-10 11:15:54 UTC
Creator: ankit
Created: 2014-11-10 11:15:54 UTC
Size: 67.73 KB

The attachment is not viewable in your browser due to security restrictions enabled by your Apache OpenOffice (AOO) Bugzilla administrator.

In order to view the attachment, you first have to download it.

Actions: View
Attachments on issue 125845: 84180