You are downloading the Directory of Stars AppXBundle file v2017.812.1658.0 for Windows Phone. Directory of Stars is a free and useful Books & Reference app: The appendix contains a description of the stars. As implemented in the application easy ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Directory of Stars 2017.812.1658.0 AppXBundle file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Directory of Stars AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.