You could have downloaded WDiff 3.2 from our software library for free. The most popular version among WDiff users is 3.2. This software is a product of Kostas Papadimakis. WDiff lies within Office Tools, more precisely Document management. The program's installer is commonly called wdiff.exe.
From the developer:
A small (can be used from a floppy) files/directories comparison and copy/move utility with individual marking of files/directories to be compared or copied/moved. It has on screen results of differences in a structured list, marking/unmarking of files, scheduling of jobs, wildcard marking/unmarking, save and load of file lists, pause/stop buttons, many statistics on the results and many options.
You may want to check out more software, such as eXcelatorCTR, Rapidocs Classic+ or Beam 2D, which might be related to WDiff.