regarding hashcat-utils : combinator

I was trying to combinate two files in windows but didn't succeed.
My batcode

combinator.exe file1 file2 > file3

When I run it, file3 stays empty (zero bites)

Please tell me what I did wrong.

thank you
either your input files are empty or there was an error. run "combinator.exe file1 file2" in command prompt and check the output.