use v5.16;
use strict;
use warnings;
use open qw(:std :utf8); # Set the default encoding for STDIN, STDOUT & STDERR to UTF-8 
use Encode qw( decode );
use IPC::Run3 qw( run3 );

use constant CORECONVERTEREXE => 'C:\Program Files\dBpoweramp\coreconverter.exe';
my $filepath = shift;
my @convcmd = ( 
	"${\CORECONVERTEREXE}", "-outfile=nul", "-convert_to=wave", "-errorfile=core.err", 
	qq(-infile=$filepath)
);
my $tempoutput1 = decode( 'UTF-16LE', GetCommandOutput(@convcmd) );
print "$tempoutput1\n";

sub GetCommandOutput # (command-string [, params])
{
	my $stdout = '';
	my $stderr = '';
	my $exe = $_[0];
	print "Command: "; 
	print qq('$_' ) foreach (@_); 
	print "\n";
	eval { run3 \@_, \undef, \$stdout, \$stderr };
	if		( $@ )	
		{ say "$exe error: $@"; }
	elsif	( $? )	
		{ say "$exe exited with code $?"; }
	else
		{ say "$exe completed successfully"; }
	return $stdout;
}