STEP 1

It doesn’t work because it wasn’t a valid registry format. You can edit the registry directly, adding the values in that post… or copy between the lines below and paste into notepad, save as a reg file and run.
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Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}]
“AppID”=”{534A1E02-D58F-44f0-B58B-36CBED287C7C}”
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STEP 2

1. Clear the contents of following 2 ‘TEMP’ folders

%temp%
%userprofile%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\