1. QUESTION
copy c:\aaa\a.txt C:\Users\igor\AppData\Local\Temp\file1.txt
copy c:\aaa\b.txt C:\Users\igor\AppData\Local\Temp\file2.txt


C:\cygwin\bin>diff -a --binary C:\Users\igor\AppData\Local\Temp\file1.txt diff 
-a --binary C:\Users\igor\AppData\Local\Temp\file2.txt 2>&1
diff: extra operand `C:\Users\igor\AppData\Local\Temp\file2.txt'
diff: Try `diff --help' for more information.

C:\Programs\Vim\vim81>diff -a --binary 
C:\Users\igor\AppData\Local\Temp\file1.txt diff -a --binary 
C:\Users\igor\AppData\Local\Temp\file2.txt 2>&1
diff: extra operand
diff: Try `diff --help' for more information.

C:\Programs\Vim\vim81>diff -a --binary 
C:\Users\igor\AppData\Local\Temp\file1.txt
diff: missing operand
diff: Try `diff --help' for more information.


Should this be one or two commands? I tired both and getting error.


2. QUESTION
I probably did something wrong.


3. QUESTION
I don't know, but we need to answer the question why does it perfectly works 
with v8.1.0359 but fails in v8.1.0366 without changing Cygwin in any way.

It would be nice if I could test each of the version between v8.1.0359 and 
v8.1.0366 to troubleshot which of the patch changed the behavior. What do you 
think?
I don't know how complicated is that someone in your team generated zip file 
for each of the version and if this helps at all.

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