This article explains how to change file extensions in Windows 11, as well as discusses the difference between file extensions and file types.

Enhance Windows File Explorer with these 3 essential add-ons that fix common pain points, improve functionality, and customize the interface to suit your needs.

os.path.join (folder, filename) ensures the path is correct for the system. On Windows, it uses backslashes (reports\summary.txt); on Linux and macOS it uses forward slashes (reports/summary.txt).