.poly file: how to open it on Windows

2 Windows apps register the .poly extension. Install one of them to open the file with a double-click.

• 
  JOSM

  JOSM is an extensible editor for OpenStreetMap (OSM) for Java 17+

  Open source 19613 108.7K ↓
• 
  FreeCAD

  A general purpose open source parametric 3D CAD modeler

  Open source 1.1.4 ★ 34.6K

Related guide: Change the default app for a file type in Windows