Hi all,

A strange thing happens to me when trying to add a new Add-in to the
list of available Add-ins in Excel XP:

Currently there are 15 Addins listed in my Addin dialog screen
(Tool/Add-ins...). Using COM Automation (via Pascal scripting in Inno
Setup), I am trying to add one more to the list. The code is similar to
this (but slightly different due to the Pascal script requirements).

Dim oXL as Object, oAddin as Object

Set oXL = CreateObject("Excel.Application")
oXL.Workbooks.Add
Set oAddin = oXL.Addins.Add(..\"MyAddin.xla",True)
oAddin.Installed = True
oXL.Quit

This works fine.
However, my Add-in should only be activated when the user uses a
specific template workbook. So I don't want to have it installed as a
default, just registered with Excel so it is available in the Add-ins
dialog window. Also this works fine. So what is the problem you might
think?

It turns out that if the Add-in dialog is already filled with Add-ins
(i.e. 15 or more), that the newly added Add-in can not be found in the
list anymore! If I get rid of just one Addin from the available list of
Add-ins, than there is no problem, but 15 Add-ins just seems to be the
critical number here.

A work-around is to leave the Add-in installed using code similar as
above and have code in the template file that ensures that the Add-in is
uninstalled when that template file is closed. But I just wondered why
this strange behaviour occurs. Is it true that there is a maximum number
of Add-ins that can be handled normally.

I am sure somebody must have seen this before, but searching the
archives did not bring me any further.

Anybody?

Best regards,

Bennie Douma

Excel XP / Windows XP Home Edition

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