Its a .odt file extension you will have to create an association to open it or use a later version of windows, I had the same problem.
The following is the e-mail content. During Ducati’s on-going product quality tests, they have determined that there is the remote likelihood that the rear speed sensor will fail As a result, the rear speed sensor must be replaced with a new modified part We wish to assure you that the problem has not occurred in any motorcycles in service, it has only occurred during an accelerated test performed to simulate the maximum life of components. This safety campaign is being conducted as a precaution. Required service will be performed at no charge to you and will take a short time. Please contact us to arrange an appointment We apologise for any inconvenience this may cause you, and trust that you will appreciate Ducati’s attention to product quality.