You are downloading the AppMachine Previewer XAP file v18.104.22.168 for Windows Phone. AppMachine Previewer is a free Books & Reference App: Use this previewer to preview any app that is being build with AppMachine's mobile app building platform. With this previewer you can watch apps. You can now download the offline XAP package file to install & try it.
Download Locations for AppMachine Previewer 22.214.171.124 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 AppMachine Previewer XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.