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my @args = ("start",$file,$file);

for (@args) {
  # Apply smart-ish double quotes
  if (/ /) { $_ = qq{"$_"}; }
};

  $_ = '"' . $_ . '"';
  # or 
  $_ = "\"$_\"";

system(@args) == 0
  or warn "Couldn't launch '$file' : $!/$?/$^E";