It appears that its only for comparing ASCII files. Here's what the
website
http://fcu.smibe.com/ReadMe.txt says:
Readme file for FCU, File Compare Utility
Last updated: 23 November 2001.
Current Version: 1.3.0
0. Description
----------------
FCU is a file compare utility for comparing text files. The compared
files are displayed in three windows: left file window, right file window
and an extra window were the composed file will be displayed.
Ver. 1.4 seems to be shareware.
OR were you referring to some other FCU?
GR