I have an colleague that has made a reference to a type library. The type
library was originally written in C# and does a number of "fancy" things.
Unfortunately, he has added this reference after improving the type library
several times using the same name to his Excel file. This results in the
"references" box containing four items with the exact same name, but
referencing 4 different versions of the same library. Neat.

Is there a way to remove a reference from the reference list permanently?
And/or is there a good way to fix this situation assuming the need for the
type library cannot be changed?

Thanks!

Mark