procedure RegisterTLB(FileName: String);
var
  WFileName, DocName: WideString;
  TypeLib: ITypeLib;
  LibAttr: PTLibAttr;
  DirBuffer: array[0..MAX_PATH] of char;
begin
  if ExtractFilePath(FileName) = '' then
  begin
    GetCurrentDirectory(SizeOf(DirBuffer), DirBuffer);
    FileName := '\' + FileName;
    FileName := DirBuffer + FileName;
  end;
  if not FileExists(FileName) then
    raise Exception.CreateFmt('Datei "%s" nicht gefunden. Registrierung fehlgeschlagen!', [FileName]);
  WFileName := FileName;
  OleCheck(LoadTypeLib(PWideChar(WFileName), TypeLib));
  OleCheck(TypeLib.GetLibAttr(LibAttr));
  try
    OleCheck(TypeLib.GetDocumentation(-1, nil, nil, nil, @DocName));
    DocName := ExtractFilePath(DocName);
    OleCheck(RegisterTypeLib(TypeLib, PWideChar(WFileName), PWideChar(DocName)));
  finally
    TypeLib.ReleaseTLibAttr(LibAttr);
  end;
end;