You are downloading the Postcards XAP file v220.127.116.11 for Windows Phone. Postcards is a free and useful Social app: Send photos to random user and get one back! Postcards is a very simple photo sharing app. All you have to do is click and send a photo ... You can now download the offline XAP file to install & try it.
Download Locations for Postcards 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Postcards XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.