Swashingtondc.7z <Must Read>

: Datasets from the Interactive Zoning Info System (IZIS) including current zoning regulations and boundary maps.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. Does 7z compress better than zip? - Microsoft Community Hub

While the exact contents depend on the source (e.g., Open Data DC or the Zoning Handbook ), files with this naming convention typically include:

: The 7z format can split very large city models or datasets into smaller parts for easier transfer.

: Uses the LZMA compression algorithm to significantly reduce the size of large geospatial datasets, making it easier to download and store than standard ZIP files.

: Information related to natural resource conservation or social services like those listed in the DC DHS Ward 7 Vision . Access & Compatibility

The file refers to a compressed archive typically used in geospatial or city planning data contexts, specifically for the City of Washington, DC .

: Layered information for District Police PSAs , Advisory Neighborhood Commissions (ANCs) , or ZIP code polygons.