Hello,
I have problem with HSSF component. I use MS Office 2000 (Czech localize). When 
I read and write workbook:
        POIFSFileSystem fs      =
                new POIFSFileSystem(new FileInputStream("c:\\workbook1.xls"));
        HSSFWorkbook wb = new HSSFWorkbook(fs);
        HSSFSheet sheet = wb.getSheetAt(0);
        //HSSFSheet sheet1 = wb.getSheetAt(1);
        HSSFRow row = sheet.getRow(3);
        HSSFCell cell = row.getCell((short)3);
        if (cell == null)
            cell = row.createCell((short) 2);
        cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
        cell.setCellValue(80);

        // Write the output to a file
        FileOutputStream fileOut = new FileOutputStream("workbook2.xls");
        wb.write(fileOut);
        fileOut.close();
When I open workbook2.xls in MS Excel error occured in MS Excel "Error in file: 
some number formats may be lost" and some data are losted in last sheet (I have 
two sheets in workbook- first sheet is OK, but second sheet have some data 
lost). I try use MS Excel 97, but I get same result.
Do you have any idea?
Best Regards
Pavel