Messages

I am ignorant but trying to figure this out.  I have a windows phone that I hope to use as a GPS for Grand Canyon hiking.  When I try to download topos from GPSFiledepot I get a fail message saying WIndows phone doesn't support this format yet it seems others with Windows phones are able to do it.

Any hints, clues, advice that might get me going in the right direction or is this impossible with this phone?  Are there other map formats that I could be able to make it work with?  Do I need an app to allow my phone to deal with these maps (downloading and reading)?

Also, any recommendations for apps (preferably free or cheap) that work well on a Windows phone for hiking GPS would be greatly appreciated.

Thanks for your patience!