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[Matze]

Delphi-Quellcode:

function DelDir(dir: string): Boolean;
uses
ShellApi;
...
var
  fos: TSHFileOpStruct;
begin
  ZeroMemory(@fos, SizeOf(fos));
  with fos do
  begin
    wFunc  := FO_DELETE;
    fFlags := FOF_SILENT or FOF_NOCONFIRMATION;
    pFrom  := PChar(dir + #0);
  end;
  Result := (0 = ShFileOperation(fos));
end;

Hätte dir aber auch die Suche geliefert.