The file extension was weird: .gmpc .
This latest build of Global Mapper offers a range of enhancements and additions, including: global mapper 2210 build 021721 incl patch c 2021
I looked at my screen. Global Mapper was still open. But the cursor was moving on its own, dragging a selection box around the glyphs. The file extension was weird:
With Global Mapper 22.10 Build 021721 and Patch C 2021, you can: 2021. Blue Marble Geographics Global Mapper
Top 5 New Features of Global Mapper v22. 1. February 17, 2021. Blue Marble Geographics
Global Mapper, Blue Marble, GIS software, LiDAR, raster, 3D visualization, version 22.10, Patch C, 2021