.py3 file: how to open it on Windows

3 Windows apps register the .py3 extension. Install one of them to open the file with a double-click.

About the format

Format

Python 3 script

MIME type

text/x-python3

Format data: freedesktop.org shared-mime-info and PRONOM (The National Archives, UK).

• 
  CP Editor

  The Missing Editor for Competitive Programmers

  Open source 7.1.2 ★ 2.2K
• S
  Sublime Text 4

  Sublime is a sophisticated cross-platform text editor for code, markup and prose.

  Proprietary 4.0.0.421500
• S
  Sublime Text 4 (Dev)

  Sublime is a sophisticated cross-platform text editor for code, markup and prose.

  Proprietary 4.0.0.421400

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