Shanell said:
What is a compound document, and why is it needed?
Broadly speaking, you can think of a compound file as one physical disk file
that contains one or more virtual files within it. For example, a single XLS
file on disk can contains two virtual files: the workbook and the VBA
project. The same disk file can also include embedded files, such as an
embedded PowerPoint presentation. These logically independent files are
stored in a single disk file.
See
http://msdn2.microsoft.com/en-us/library/ms693383.aspx for additional
info. Go to msdn.microsoft.com and search for "compound file" and you'll
find quite a bit of info.
--
Cordially,
Chip Pearson
Microsoft MVP - Excel, 10 Years
Pearson Software Consulting
www.cpearson.com
(email on the web site)