Hi Thomas,

The last place it was publicly documented was in the Excel 97 SDK, which
is now out of print. You might be able to find a copy from a used book
seller. The only other alternative is to write Microsoft and ask them for a
copy. Here's the text regarding this option from KB article Q239653:

----------------------------------------------------------------------------
--
NOTE: The Microsoft Office binary file format documentation was removed
from the MSDN in 1999. If you would like to receive this documentation,
you can send e-mail to , or mail to:

Office File Format Documentation Request
One Microsoft Way
Redmond, WA 98052

Requests should contain a detailed description for planned use of this
documentation.

----------------------------------------------------------------------------
--

--
Rob Bovey, MCSE, MCSD, Excel MVP
Application Professionals
http://www.appspro.com/

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"Thomas Kregeloh" wrote in message
...
Hi there,
is the binary file format of Excel-files documented (it surely is -
somewhere), and is this documentation available anywhere? I tried to
google
for it but wasn't lucky. I'd like to generate Excel files outside of
Excel.
TIA
Thomas