Actually, the error is not in the binmode command, this error is generated by $file_handle being undefined, and this is due to the fact that you are using this code : my $file_handle = $grab_file->upload("file$file_num");

this is right from the CGI.pm documentation:

The filename returned is also a file handle. You can read the contents of the file using standard Perl file reading calls.

so you don't need that line, $file is already the filehandle, so you set binmode $file and it should work.

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