These archives usually contain topographic surveys, land boundary maps (bornage), and site plans required for building permits or infrastructure projects like bridges or housing.
To access the contents of a .7z file, you need a decompression tool such as 7-Zip (Windows) or Keka (macOS). A quick introduction to SpatiaLite Topology - gaia-gis TOPO.7z
The name also appears as a handle or tag in gaming communities. These archives usually contain topographic surveys