You are downloading the Slim Mediaplayer XAP file v220.127.116.11 for Windows Phone. Slim Mediaplayer is a free and useful Music app: This is a simple app to play locally stored music. Its minimalistic design is designated to spare resources and to allow an intuitive ... You can now download the offline XAP file to install & try it.
Download Locations for Slim Mediaplayer 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 Slim Mediaplayer XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.