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AptDiff is a visual text / binary files comparison and merging utility for Windows 2000/XP/2003/Vista. It is highly useful for web designers, software developers, and other professionals. AptDiff features a double-pane view that allows for side-by-side comparisons, with customizable color-coding indicating whether each line/byte is added, deleted, or changed. AptDiff can also export the side-by-side comparison to a nicely formatted HTML page for publishing on the web.