From what I've read the Excel file format is a binary file format with
specific internal data structures. If you need to read/write to an Excel file
you are probably best off using Automation to start & control Excel. There
is an intro here
http://msdn.microsoft.com/library/de...plications.asp
--
HTH

Simon


"johan mårtensson" wrote:

Hi,

I'm wondering what the excel file format looks like as I would like to
be able an existing excel file from another Win32 application. Or are
there better ways to do this (using win32 API)

thanks
/johan