.HCX File Extension
What is an HCX file?
2D or 3D chart generated by ChartXL, a Harvard Graphics data analysis and presentation application; stores data and display information; can be used for saving surface plots, line graphs, polar charts, XYZ bar graphs, Gantt charts, and other visualizations.
Chart XL is supported for Windows 95, 98, ME, NT 4.0, 2000, and XP single-mode platforms. However, Harvard Graphics ChartXL is discontinued and no longer available to purchase.