Created attachment 27341 [details]
Corrupted file created by poi 3.7, workbook with 1371 sheets

I use the version of POI(3.7) to create 1400 sheets in a workbook. And when I open the XLS file generated by the programe, the MS excel 2003 pops the error like bellow. 

Damage to the file was so extensive that repairs were not possible.  Excel
attempted to recover your formulas and values, but some data may have been
lost or corrupted.

In addition,  if the number of sheet is under 1370, it can be opened normally.  Also when I use POI 2.5.1 the workbook is generated fine.

Attached is the generated file and here is the test code:

package com.test;

import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.DataFormat;
//import org.apache.poi.ss.util.Color;
//import org.apache.poi.ss.util.Region;
public class poiTest36 {

	Workbook m_wb;
	Font m_boldFont;
	CellStyle cellStyle;
	poiTest36() {
		m_wb = new HSSFWorkbook();

		m_boldFont = m_wb.createFont();
		m_boldFont.setBoldweight( Font.BOLDWEIGHT_BOLD );
		cellStyle=m_wb.createCellStyle();
		
	}
	
	public void createSheet(){
		Sheet sheet=m_wb.createSheet();
		
		
		
		cellStyle.setFont(m_boldFont);
		cellStyle.setBorderBottom( CellStyle.BORDER_MEDIUM );
		cellStyle.setBorderRight( CellStyle.BORDER_MEDIUM );
		cellStyle.setBorderLeft( CellStyle.BORDER_MEDIUM);
		cellStyle.setBorderTop( CellStyle.BORDER_MEDIUM);
		Row row=sheet.createRow(1);
		
		Cell cell=row.createCell((short)1);
		cell.setCellStyle(cellStyle);
		cell.setCellValue("Felix S");
	}
	
	public void save( String filename) throws Exception  {
		
		FileOutputStream fileout = new FileOutputStream( filename );
		m_wb.write( fileout );
		fileout.close();				
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		poiTest36 p = new poiTest36();
		for(int i=0; i<1371; i++) {
			p.createSheet();
		}
		try {
		p.save("/home/fsanchez/tmp/test.xls");
		}
		catch (Exception e){
			System.out.println("got exeption:" + e.getMessage());
			e.printStackTrace();
		}
	}

}