Cameo Enterprise Architect Reader Plug-in

Hi all,

I am new to using Enterprise Architect and have installed the product in Reader mode.  I have a colleague who is testing the application with a known working project.  He tries to load a report file (.xlsx) but receives an error stating that 'You'll need a new app to open this report link'.  

Is there a plug-in needed and if so, how do I get hold of it and install it please?

Thank you in advance.

Paul