hi there,

i'm new to writing custom things for excel, and what i wanted to know
is: is it possible to write some kind of 'import' plugin, that would
allow me to open my own file format and put it into an excel
spreadsheet?

what i want to be able to do is have a standard .xls file, add some
extra 'header' information to it, store the .xls + some header info in
a custom file of my own, and then be able to run excel, open my custom
file, dispose of the extra header info and then load the embedded .xls
file.

is this possible?

could someone point me in the right direction in terms of where to
start?

many thanks in advance,
dug.