Change File Extension (.txt .csv .xlsx .zip) in Windows

The video tutorial explains how to manage file extensions in Windows. It covers viewing and changing file extensions, converting files between different formats like CSV and XLSX, and exploring the structure of Excel files by converting them to ZIP archives. The tutorial emphasizes the importance of file extensions in determining which programs open specific files.

What is the significance of file extensions in Windows?

Describe how to save a file as an Excel workbook from a .CSV format.