Avery Pennarun demonstrates the unconventional practice of using Git to track changes in a Windows installation, specifically with a fresh Windows 98 setup. By initializing a Git repository in the Windows directory and creating branches for different versions of Microsoft Office, Pennarun can seamlessly switch between these environments to test plugins. This creative use of Git allows for efficient testing and version control, showcasing an innovative approach to managing software environments. The post, written by Chris Wanstrath, highlights the flexibility and power of Git in managing non-traditional projects.