.pen file: how to open it on Windows

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

• 
  OpenPencil

  An AI-native design editor and open-source Figma alternative.

  Open source 0.16.0 ★ 9.2K
• 
  OpenPencil

  An AI-native vector design tool that turns prompts into editable product interfaces.

  Open source 0.8.4 ★ 6.4K
• 
  Pencil-Desktop

  Dream on canvas. Land in code.

  Proprietary 1.2.0 ★ 22

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