default acrobat xi pro send mail to default email application and remember my choice 2008R2

I have 2008R2 Remote Desktop Servers with Adobe Acrobat XI pro.  When a new user tries to send a pdf via email, it pops up a message "How would you like to send this email"  they have to pick "Default email application (Microsoft Outlook) and Remember my choice.  Then the next time they try to send an email, the get a warning "This email will be sent using "Default email application (Microsoft Outlook)".  Click on 'Change Preferences' to change your default account settings.  They have to Click Do not Show this message again, and then continue.  (actually I have a couple of users that have to go through this process Every time they sign on to the remote desktop server),

I downloaded the group policy adm pack and I can not find any settings to default this for a user.

Is there any group policy settings or a registry entry I can make on the remote desktop server to default these settings?

Thank you in advance