file comparison tool
ExamDiff - File Comparison
ExamDiff is a Portable and Free File Comparison Tool that can be used to compare files to see if they are identical. It is a freeware visual file comparing application that features browse and drag and drop file comparison, can automatically detect file changes, and provides plenty of customizable display options.
TextDiff - File Comparison Tool
If you are looking for a tool to compare files or text code changes, TextDiff may be the answer. As a free file comparison tool, it allows you to easily view differences between two files or compare them side-by-side.