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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, ShellCtrls;

type
  TForm1 = class(TForm)
    ShellTreeView1: TShellTreeView;
    ShellListView1: TShellListView;
    Label1: TLabel;
    Label2: TLabel;
    Button2: TButton;
    Label5: TLabel;
    Button1: TButton;
    procedure ShellListView1AddFolder(Sender: TObject;
      AFolder: TShellFolder; var CanAdd: Boolean);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

 uses unit2;
{$R *.dfm}

procedure TForm1.ShellListView1AddFolder(Sender: TObject;
  AFolder: TShellFolder; var CanAdd: Boolean);
  var XExt: string;

begin   
XExt := ExtractFileExt(AFolder.PathName);
if XExt = '.txt'
then CanAdd := true
else CanAdd := false;
end;

procedure TForm1.Button2Click(Sender: TObject);
Var
infile: Textfile;
pfad_file_original:string ;
outfile: Textfile;
lese, schreibe: string;
begin
 try
  Label5.Caption := ShellListView1.SelectedFolder.PathName;
except
  raise Exception.Create('Bitte Datei wählen!');
end;
pfad_file_original:=ShellListView1.SelectedFolder.PathName;
  Assignfile(infile, pfad_file_original);
  AssignFile(outfile, 'c:\ziel.txt');
  Reset(infile);
  Rewrite(outfile);
  while not Eof(infile) do
  begin
     ReadLn(infile,lese);
     schreibe:=lese;
     WriteLn(outfile,schreibe);
  end;

   closefile(outfile);
   closefile(infile);
end;     

procedure TForm1.Button1Click(Sender: TObject);

begin
  Form2.ShowModal;   (*<---hier hakt`s)  *)
end;

end.					

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unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
self.close; (*<--- hier hakt´s *)
end;

end.					

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program Project1;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.					

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program Project1;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {Form2};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.CreateForm(TForm2, Form2);
  Application.Run;
end.					

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program Konverter;

uses
  Forms,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {Form2};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.CreateForm(TForm2, Form2);
  Application.Run;
end.					

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procedure TForm1.Button1Click(Sender: TObject);

begin
  Form2.Enabled := true;
  Form2.ShowModal;   (*<---hier hakt`s  *)
end;