Thanks serendipity! Here's what they give as options:
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-Command line options include:
Usage: ExamDiff [Filename1] [Filename2] [Options]
Filename1, Filename2 are names of files to be compared
Options are any of:
/i ignore case
/w ignore all white space in lines
/b ignore changes in amount of white space in lines
/l ignore leading white space in lines
/e ignore trailing white space in lines
/t treat both files as text files
/d show differences only
/n don't show initial "Compare Files" dialog
/sd always show initial "Compare" dialog, even if
two filenames are used
/aN scroll trough all differences with N second delay
and exit after the last difference
/?,/h print this screen
NOTE: if options /i, /w, /b, /l, /e, /t, or /d are not set,
the last used options remain in effect.
So I tried
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$pane1= <curitem>;
focus PI;
$pane2= <curitem>;
focus PI;
open """C:\Program Files\ExamDiff\ExamDiff.exe"" ""$pane1"" ""$pane2"" ""/n""";
which worked and went directly to compare...
I added the second "focus" to reset it back to original pane (right?) based on TheQwerty's vers.
BTW, I did find a link to the old freeware vers in their support forums:
http://www.prestoforums.com/viewtopic.php?f=2&t=495
It has served my basic needs for a text file compare for quite some time.
Upd/Addendum: Dumb question: How would this be adapted to compare two selected files on same pane?