World files (.sdw) are not being included in the downloaded ZIP files. This has been identified as a bug in the software that delivers the imagery. We are working to correct the issue. Current workarounds are to either:
1. Download the county-based mosaic MrSID files (the most recent imagery for any particular county) using the search phrase "county mosaic."
2. Use a web map service to "stream" the imagery into your GIS or CAD. In this case note the URLs to use now begin with https://services.nconemap.gov/secure.