I just use the follow way. I set the information in HKLM.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Excel \Addins\My2007Addin]
"CommandLineSafe"=dword:00000001
"Description"="My2007Addin by"
"FriendlyName"="My2007Addin"
"LoadBehavior"=dword:00000003
"Manifest"="C:\\bin\\My2007Addin.dll.manifest"

After it.
I open Excel, I find it can be shown in add-in, but it no use at all.

Does this way OK?

Thanks