You are downloading the Contacts+Message Backup XAP file v220.127.116.11 for Windows Phone. Contacts+Message Backup is a free and useful Productivity app: Note: To use this app, please go to Settings on your Windows Phone. This app will NOT appear in your list of installed apps. Contacts + ... You can now download the offline XAP file to install & try it.
Download Locations for Contacts+Message Backup 18.104.22.168 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Contacts+Message Backup XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.