case DSF:
Dsf dsf = (Dsf)rec;
if(dsf.fDSF == 1){
Logger.logErr("DOUBLE STREAM FILE DETECTED!");
Logger.logErr(" ExtenXLS is compatible with Excel 97 and above only.");
throw new WorkBookException("ERROR: DOUBLE STREAM FILE DETECTED! ExtenXLS is compatible with Excel 97 + only.", WorkBookException.DOUBLE_STREAM_FILE);
}
break;
case GUTS:
if (bs != null){