Re: How to build a program that can read the content of a very simple MS Excel file?

["Huge Mountain" <educatenter gmail com>]

Thank all you for your help!

I have another question:
I'm trying to get the binary format of MS Excel file with this book, excelfileformat.pdf from 
http://sc.openoffice.org/excelfileformat.pdf 
In part 5.4, page 81, we have:
Structure of the Page Settings Block in the Worksheet Substream:
○ HORIZONTALPAGEBREAKS ➜6.54
○ VERTICALPAGEBREAKS ➜6.107
○ HEADER ➜6.51
○ FOOTER ➜6.44
○ HCENTER ➜6.50 (BIFF3-BIFF8 only)
○ VCENTER ➜6.106 (BIFF3-BIFF8 only)
○ LEFTMARGIN ➜6.62
○ RIGHTMARGIN ➜6.81
○ TOPMARGIN ➜6.103
○ BOTTOMMARGIN ➜6.11
○ 
PLS
○ SETUP ➜6.89 (BIFF4-BIFF8 only)
○ BITMAP ➜6.6 (BIFF8 only)
Every record is described clearly, except PLS which isn't mentioned in this document. I don't know if it's a record or something else. I have been seen the binary format of a MS Excel file (created by MS Excel 2000). If I consider PLS as a record, with this excel file  I have PLS's ID is 77 (equal 4D in hex) and size of following data is 1454 byte.
The excelfileformat document doesn't discribe PLS's format. Could you help me to know this "record"?
Thank in advance!