.pdn file: how to open it on Windows

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

• 
  paint.net

  An image and photo editing software for PCs that run Windows.

  Free 5.1.12 11.6M ↓ ★ 1.9K
• 
  Imagine

  Imagine Freeware Image & Animation Viewer for Windows

  Free 2.7.2 2.4K ↓ ★ 121

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