...herausfinden, ob Word installiert ist?

uses
Registry;

function IsWordInstalled: Boolean;
var
Reg: TRegistry;
s: string;
begin
Reg := TRegistry.Create;
try
Reg.RootKey := HKEY_CLASSES_ROOT;
Result := Reg.KeyExists('Word.Application');
finally
Reg.Free;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if IsWordInstalled then
ShowMessage('MS Word is installed.');
end;

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