You are downloading the Media Explorer APPX file v126.96.36.199 for Windows Phone. Media Explorer is a free and useful Utilities & Tools app: Media explorer is an awesome file exploring apps that helps you manage all your storages, cloud and local at your fingertips! Move, copy, delete, ... You can now download the offline APPX file to install & try it.
Download Locations for Media Explorer 188.8.131.52 APPX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline APPX File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Media Explorer APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.