I wanna send workbook by e-mail thru E-Mail button, but nothing happens when I press it.

I have The Bat! e-mail client. It is set as default e-mail client.
Also, in The Bat!'s Preferences there's a button called "Install The Bat! as the Simple MAPI request handler". When I press it, following message appears:

"OK to install The Bat! as the MAPI handler?
This is required only if The Bat! is set as default e-mail client, but MAPI client programs do not invoke The Bat! for their mail operations. The old copy of MAPI32.DLL (if any) will be renamed to MAPI32TB.DLL".

How to fix this problem?