NCM_HDR16_SIG
if (UGETDW(hdr->dwSignature) != NCM_HDR16_SIG) {
USETDW(hdr->dwSignature, NCM_HDR16_SIG);
USETDW(hdr->dwSignature, NCM_HDR16_SIG);
case NCM_HDR16_SIG:
case NCM_HDR16_SIG:
case NCM_HDR16_SIG: