Some CLSID Registry keys exist but cannot be read

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I have following program that reads all CLSID registry keys and displays their name on a listbox; it is written in Delphi, but the question is not specific to Delphi; it is rather a question about the Windows Registry.

procedure TForm2.Button1Click(Sender: TObject);
var
  guid: string;
  reg: TRegistry;
  sl: TStringList;
  i: Integer;
  name: string;
begin
  memo1.Clear;

  reg := TRegistry.Create;
  sl := TStringList.Create;
  memo1.Lines.BeginUpdate;
  try
    reg.RootKey := HKEY_CLASSES_ROOT;
    if reg.OpenKeyReadOnly('\CLSID\') then
    begin
      reg.GetKeyNames(sl);
      reg.CloseKey;

      for i := 1 to sl.Count-1 do
      begin
    guid := sl.Strings[i];

    if reg.OpenKeyReadOnly('\CLSID\'+guid) then
    begin
      try
        name := reg.ReadString('');
      except
        name := '!!! <ERROR1> !!!';
      end;
      reg.CloseKey;
    end;

    memo1.Lines.Add(guid + ' ' + name);
      end;
    end;
  finally
    sl.Free;
    reg.Free;
    memo1.Lines.EndUpdate;
  end;
end;

The problem is that following registry keys do exist (they are listed in GetKeyNames), but they cannot be read (reading the default value). I get the Exception "Invalid data type for ''".

The keys which fail are:

{33297C9D-2A25-1679-1475-A1CE3901C86D} !!! <ERROR1> !!!
{45049248-47E9-7CEE-A822-1E555F74D237} !!! <ERROR1> !!!
{69C5BE90-E717-97A6-CCEF-C44D93111A5A} !!! <ERROR1> !!!
{8663D540-C578-44AE-9D24-4A9D9A4881C3} !!! <ERROR1> !!!
{9A73B3FA-50DF-3410-930D-51C35FC9237E} !!! <ERROR1> !!!
{EACF7497-3D67-8044-DE95-81429597BB8F} !!! <ERROR1> !!!

These keys do not appear in regedit.exe, even if I run RegEdit in the NT-AUTHORITY\SYSTEM context (which shows really everything).

Do you have the same problem, or is my registry somehow damaged?

asked 3 mins ago

rinntech

539

Some CLSID Registry keys exist but cannot be read