VSTO SP1 Install, Can’t Find Config File

I was installing an Excel addin across a clients production servers and for some reason when I ran the addin on one of the machines the Addin couldn’t read the config file even though it could on all the others.  After digging through registry and other settings and some googling I came across this blog post.  I prefixed the manifest location  with “file:///”  in the registry and it started working again.

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