Send CBR to Nexus 10 as CBR

Hi All,

I have a large collection of CBR comics that I read on my Nexus 10 using Comicat.

I have all of them in Calibre and I'd like to use this to transfer them to my Nexus as it works well with all my other E-Books. But when I try to send them to the Nexus I get an error message "No Suitable Formats Were Found"

Question: How can I stop Calibre from trying to convert the .CBR files to something else and just send them as .CBR ?

Thanks :help:

At the moment I'm having to copy them across manually.