HowTo: Unregister a DLL/Control when the File no longer Exists

I have a project group, in a specific location on disk, that contains
several projects. There is the main EXE and a few ActiveX DLLs.

The main project references one of the DLLs, which in turn references
another DLL. So far so good.

Periodically, I copy the entire directory hierarchy to another, similar,
location, and call it version 2; so the parent directory MyProject still
exists, but now there is one alongside it called MyProject #2. I begin
working on #2.

When I am happy with the changes in #2, I delete the original directory
structure altogether.

When I look in the references, I can still see the original controls. How
can I remove them without wading through the registry in the vain hope that
I know what I am doing? I realise that I can never include one of these as a
reference because I get an "Error loading DLL" message, but in time I get a
proliferation of entries in the references section to files that do not
exist, and at best this creates clutter but at worst it means that I have to
work through them until I find the right one to include. [Of course, until I
delete the earlier version, it is still possible to include the wrong file,
which is more serious]

TIA

Charles


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