Thank Nick. I'll test it out. 

On Tue, Oct 4, 2011 at 10:53 AM, Nick Dokos <nicholas.dokos@hp.com> wrote:
Marcelo de Moraes Serpa <celoserpa@gmail.com> wrote:

> *bump* ... I am being too stupid :) I could not find it in the documentation.
>
> Thanks,
>
> - M
>
> On Mon, Oct 3, 2011 at 1:48 PM, Marcelo de Moraes Serpa <celoserpa@gmail.com> wrote:
>
>     Hey guys,
>
>     I'm using org-export-icalendar-combine-agenda-files to export the agenda files into one .ics
>     file. However, I'd like to exclude a particular org file from this export. How could I do it?
>

Can't do it with org-export-icalendar-combine-agenda-files as it stands, but
if you look at the code, all it does is:

,----
| (defun org-export-icalendar-combine-agenda-files ()
|   "Export all files in `org-agenda-files' to a single combined iCalendar file.
| The file is stored under the name `org-combined-agenda-icalendar-file'."
|   (interactive)
|   (apply 'org-export-icalendar t (org-agenda-files t)))
`----

so it just applies org-export-icalendar to the list of file that org-agenda-files
returns. All you have to do is massage that list a bit:

(defun mdm/org-export-icalendar-combine-agenda-files-with-exclusions ()
      (interactive)
      (apply 'org-export-icalendar t
             (mdm/exclude '("~/org/foo.org" "~/org/bar.org") (org-agenda-files t))))

(defun mdm/exclude (items lst)
 (if (null lst)
     lst
   (if (member (car lst) items)
       (mdm/exclude items (cdr lst))
     (cons (car lst) (mdm/exclude items (cdr lst))))))

Mostly untested.

Nick