The software is designed to communicate with remote image servers via HTTP. With the right configuration, you aren't just looking at local files; you are pulling live data from: in Chile. The Hubble Space Telescope archives. The NTT and CFHT Science Archives. 3. Amateur Radio & Satellite Tracking
The zip likely contains Tcl/Tk scripts. SkyCat is famous in the dev community for its extensible architecture, allowing you to write your own plugins to filter astronomical data. Access to Data Sources and the ESO SkyCat Tool - NASA ADS SkyCat_2023-01.zip
If you are looking for a way to "crack open" the zip and see what's inside without fully installing it: The software is designed to communicate with remote