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use IPC::Run3 'run3';
run3 ['powershell', '-Command', 'Invoke-WebRequest', '-Uri', $uri,
    '-OutFile', $filename, '-UseDefaultCredentials'];
$? and die "run3 failed with \$?=$?";

use File::Temp qw/tempfile/;
use IPC::Run3 'run3';
...
    unlink $tfn;
    return $data;
}