Excel 2003, .Net 1.1, Office Addin not loading

[KeithM]

Hi
Have recently had to return to an office 2003 addin dll project. Basically
I have got it working fine, it loads up in Word and Powerpoint fine. But
try what I may I cannot get it to load in Excel.
I have the dll registered with COM ok (I presume as it works with Word and PP)
I have the registry setup in this place for all 3 apps:
HKLM\Software\Microsoft\Office\Excel\Addins\my-prog-id
HKLM\Software\Microsoft\Office\Word\Addins\my-prog-id
HKLM\Software\Microsoft\Office\Powerpoint\Addins\my-prog-id

beneath all those keys I have 3 values:
Description: "No Descriptin provided."
FriendlyName: "OfficeAddin"
LoadBehaviour: "Ox00000003"

I have created another "dummy" addin and that works fine with all 3 apps
dscussed.

Can anyone advise why my original is failing to load up or how to find out?

Thanks