Since Microsoft has now discontinued Windows Mobile / Windows Phone / Windows 10 Mobile / Windows RT / Windows 8.1. These applications are no longer supported and are no longer available for download. I’m currently evaluating RAD Studio (using Delphi or C++ Builder) for iOS / iPhone development.
Local mosque guide is now available to download for your Windows 8.1 PC https://www.microsoft.com/en-gb/store/apps/local-mosque-guide/9nblggh1r3r3
Local mosque guide:
No matter where you travel, you’ll be able to locate a mosque locally so that you never miss your prayers. Get directions & information to the local mosques with the ability to send them to others via SMS or e-mail.