Is there some desktop app to open .map files?

I have downloaded .map and .rtd files (packed in zip) from bicycle navigator site, to check is it’s maps suitable to me, before buying. But can’t open these files. Any help? Files from here Download – iGPSPORT- Sports is in our life, and it makes life better

In text editor these files have this header: mapsforge binary OSM рЂ  Џж ЊТЁZ-уctФ{tЋ9Ч`· Mercatoremapsforge-map-writer-0.16…

[Note: this should be moved Help and support category]

That looks like a mapsforge format file, and yes there is likely a desktop app for that:

Cruiser says “unsupported version”, tried some android apps from list and no luck…