procurar um arquivo pasta Downloads

   unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  FileName, DownloadFolder: string;
  SearchRec: TSearchRec;
  Found: Boolean;
begin
  FileName := Edit1.Text;
  DownloadFolder := GetEnvironmentVariable('USERPROFILE') + '\Downloads\';
  Found := FindFirst(DownloadFolder + FileName + '.*', faAnyFile, SearchRec) = 0;
  if Found then
    ShowMessage('O arquivo ' + FileName + ' foi encontrado na pasta de downloads.')
  else
    ShowMessage('O arquivo ' + FileName + ' não foi encontrado na pasta de downloads.');
  FindClose(SearchRec);
end;

end.