Either use the fully-qualified name of the function, or import it in the use statement. 
# Either this:
use Win32API::File;

my $uOldMode = Win32API::File::SetErrorMode( $uNewMode );

# or this:
use Win32API::File qw( SetErrorMode );

my $uOldMode = SetErrorMode( $uNewMode );

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In reply to Re^3: -e on windows giving error by Util
in thread -e on windows giving error by Rudolf

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