Re: How to delete multiple ActiveX controls in Internet Options -> Programs listing?

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ju.c wrote:

"VanguardLH" <V@xxxxxxxxx> wrote in message news:ggit5b$fc3$1@xxxxxxxxxxxxxxxxxxxxxx
I've noticed that over time there are multiple entries for the same
ActiveX control listed in Internet Options -> Programs -> Manage Add-Ons
when selecting "Add-ons that have been used by Internet Explorer". For
example, I now have 2 entries for "Microsoft Terminal Services Client
Control (redist)" which lists mstscax.dll for the control.

I know that some add-ons use the same file but for different
functionality or methods from them but this one seems to be a pure
duplicate. I already went to the Add/Remove Programs applet and
uninstalled the Terminal Services Web Client but both these entries
remain.

I want to get rid of them so I can see what the client would see when
they visit a host that is running IIS with TSWEB added (Remote Desktop
Web Connection). That lets them remote into the host using a web
browser in case they are on a host where RDC (Remote Desktop Client)
isn't available and they cannot install it (but they may be able to
install the AX control). I want to see what prompts they would get,
like telling them to install the Remote Desktop Connection Web Client
(and ActiveX control). But it's already on my test host so I can't see
the process the client would go through.

I found several registry entries (and more than just 2 of them; 5 CLSID
entries are for it) that list the %systemroot%\system32\mstscax.dll file
as the InProcServer32 entry and the key is named "Microsoft Terminal
Services Client Control (redist)" but digging into the registry to
delete references to this AX control could end up with a corrupted setup
for IE. I could try deregistering the file using regsvr32.exe -u but
that isn't really an uninstall of the AX control but merely erasing the
pointer in the registry to it. Be great is there were a more elegant
method of wiping this AX control. But then maybe it's part of the RDC
(Remote Desktop Client) that is installed in Windows XP Pro to provide
that client - but why list its AX control *twice* in the add-ons for IE?

Follow these steps to remove an ActiveX controll:

1. Open 'Start Menu-->All Programs-->Accessories-->System Tools-->Disk Cleanup'.
2. Highlight "Downloaded Program Files" then click the "View Files" button.
3. In the opened window, right-click on the item that you wish to delete and select "Remove".


The "Downloaded Program Files", when selected in Internet Options ->
Programs -> Manage Add-ons, will let you click the Delete key to get rid
of those programs (and which are stored under C:\WINDOWS\Downloaded
Program Files). What I was looking for is references to the prior used
AX control in the "Add-ons that have been used by Internet Explorer".

That there are multiple entries for the same file, in this case, means
it is likely that there are or were multiple class IDs for the same
control. I cannot use the Remote Desktop Web Connection method to
hookup to another host using a web server on that other host unless I
have these previously used AX controls enabled, but there are 2 of them
listed and I'm not sure which is needed or if both are needed (since
they point at the same mstscax.dll file). Yet there are 5 class IDs for
the same mstscax.dll file and I don't which of those go which of the 2
entries in the add-ons listing in IE.

In a clean install of Windows XP Pro, and after applying SP-3 and
subsequent updates, but before ever connecting to an IIS web server
which has TSWEB added (Terminal Services Web Connection), mstscax.dll is
not listed even once in IE's add-ons for those that have been previously
used by IE. Not only is this a list of previously used controls (some
of which are AX controls) but also whether they are enabled or not for
reuse. I suspect if I got rid of those registry entries matching up
with these previously used AX controls (which can be enabled or disabled
for status regarding reuse) that I might engender a prompt that I've
seen before in this RDP-web setup. I'm not positive but then I'd still
like to know how to clean up this prior-used control list for multiple
entries. I haven't found from where IE compiles this list. I've used a
couple Nirsoft utilities but they didn't list these particular
duplicated entries.

I'm not even sure how an add-on gets disabled. Maybe they use the
killbits to disable a control. If so, I could enable one of the
duplicated entries and see which one had its killbit removed, and repeat
for the other entry. Then I could see which CLSIDs in the registry were
associated with which entry in IE's add-on list. I could then check
interdependencies on that class ID to see how I might clean up the list.
I'll ponder over this and read http://support.microsoft.com/kb/240797
tomorrow. My eyeballs are itchy so it's time for bed.
.

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