It involves Excel workbooks by the way.
I did a Beyond Compare default check, not HEX.
Just tried it out HEX. There is a difference indeed.
Somewhere in the HEX mode I saw my full name (full first and last name) on one side
but just : "X. Full last name" (initial of first name) on the other side.
Then I went on to open the file and look for my name: it was not there...
Probably it was derived from file properties. My name was listed in properties, both properties were the same though.
Author: X. Full Last name
Checked again with BC in HEX mode, now full names were mentioned both sides (weird)
As a test I even went on to copy the data tables from one workbook into the other (side by side) and compared each cell, no differences.
Anyway, thanks again.
(I posted here, it has nothing to do with Directory Opus)