Hello, guys!

Have a probs with cell format.
My cell has next format:
style.setDataFormat(format.getFormat("#,##0.00;[Red]-#,##0.00"));
It is working fine when i create new xls file:               
wb = new HSSFWorkbook();
But when I open exists xls file and add new sheet:

FileInputStream fis = new FileInputStream(file);
POIFSFileSystem poifs = new POIFSFileSystem(fis);
wb = new HSSFWorkbook( poifs );

the same code for cell formatting give me wrong result. 
My cell, when I open xls file with excel, has format: ;;;
So, as result no data in cell with such format.

Where is my probs ?