Since .7z is a high-compression format, you will need a third-party tool to extract it:
: Pre-processed map images (e.g., gmapsupp.img ) specifically formatted for loading onto GPS devices. openmaps.7z
The file is a compressed archive that typically contains geospatial data from OpenStreetMap (OSM) . Likely Contents Since .7z is a high-compression format
: Raw geospatial features like roads, buildings, and points of interest (POIs) in formats like .osm (XML), .shp (Shapefile), or .geojson . or .geojson .