FILE_OVERWRITE_IF
CreateDisposition == FILE_OVERWRITE_IF) {
{ FILE_OVERWRITE, FILE_OVERWRITE_IF }
(op->create_disposition == FILE_OVERWRITE_IF) ||
if ((op->create_disposition == FILE_OVERWRITE_IF) ||
case FILE_OVERWRITE_IF:
op->create_disposition = FILE_OVERWRITE_IF;
FILE_OVERWRITE_IF : FILE_OPEN_IF;
op->create_disposition = FILE_OVERWRITE_IF;