CGI File not working after copying to word doc and back

When I open a CGI file in txt file and edit the code and save it and run it, it works as normal.

But when I copy the code over to word doc and copy it back to the CGI file and save it and run it, it does not work.

Why is that? I did not even make any changes to the code. Just copying to word doc and back and saving it and the CGI file does not work.

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