How to Use the Windiff.exe Utility - Windows - Microsoft Learn
Unlike simple command-line tools, WinDiff can compare entire subfolder trees and highlight missing or modified files.
If you have access to an older Windows Server 2003 or XP installation disk, WinDiff is located in the Support\Tools folder within the support.cab file.
If you require more advanced features like three-way merging or support for modern file formats (Excel, PDF), consider these alternatives: Microsoft Learnhttps://learn.microsoft.com
Go to File > Compare Directories to select two folders.