Compare It!

This is a powerful file utility for merging and comparing various types of files. Features include a built-in editor with syntax highlighting, the ability to undo and redo actions, printing, html reports and support for ZIP files. Compare It! also works with non-text files, allowing you to compare the content and display the differences of files. It also includes a format converter (changing the formats to text) and is comparable to and a viable alternative to WinDiff.

New features of Compare It! include XML support, regular expressions, automatic backups, and support for Windows Registry files.

From Grigsoft:

Powerful file compare and merge utility.

Compare It! 4.0 is licensed as Shareware for the Windows operating system / platform and can be used as a free trial until the trial period ends. Compare It! is available to all software users as a free download (Shareware) with potential restrictions and is not necessarily the download of the full version.

Compare It! Virus and Malware Tests:

For security reasons, you should also check out the Compare It! virus and malware test that has been uploaded; additional Compare It! screenshots may be available, too.