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  sl:=Tstringlist.create;
  sl.loadfromfile('blablabla')
  for i:=0 to sl.count-1 do
    begin
       if sl.items[i]='Namen:' then Mode:=0
        else if sl.items[i]='Nachnahmen:' then Mode:=1
         else if sl.items[i]='EMail Adresse:' then Mode:=2
          else
         begin
            case mode of
              0: Listbox1.items.add(sl.items[i]);
              1: Listbox2.items.add(sl.items[i]);
              2: Listbox3.items.add(sl.items[i]);
         end;              
    end;
  sl.free;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    ListBox2: TListBox;
    ListBox3: TListBox;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
i : word;
sl : Tstringlist;
begin
sl:=Tstringlist.create;
  sl.loadfromfile('test.txt');
  for i:=0 to sl.count-1 do
    begin 
       if sl.items[i]='Namen:' then Mode:=0 
        else if sl.items[i]='Nachnahmen:' then Mode:=1 
         else if sl.items[i]='EMail Adresse:' then Mode:=2 
          else 
         begin 
            case mode of 
              0: Listbox1.items.add(sl.items[i]); 
              1: Listbox2.items.add(sl.items[i]); 
              2: Listbox3.items.add(sl.items[i]); 
         end;              
    end; 
  sl.free; 

end;

end.					

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type
  TAdressen:array[0..2] of String;

function Zerlege(aStr:String; aTrenner:Char):TAdressen;
var i:Integer;
begin
  i:=System.Pos(aTrenner, aStr);
  if (i>0) then
  begin
    Result[0]:=System.Copy(aStr, 1, i-1);
    Delete(s, 1, i);
  end;
  i:=System.Pos(aTrenner, aStr);
  if (i>0) then
  begin
    Result[1]:=System.Copy(aStr, 1, i-1);
    Delete(s, 1, i);
  end;
  Result[2]:=aStr;
end; // Zerlege

procedure TForm1.Button1Click(Sender: TObject); 
var i  :Integer; 
      sl :TStringList; 
      adr:TAdressen;
begin 
  sl:=TStringList.Create;
  try
    sl.loadfromfile('test.txt'); 
    for i:=0 to sl.count-1 do
    begin
      adr:=Zerlege(sl.Strings[i], ';');
      Listbox1.items.add(adr[0]); 
      Listbox2.items.add(adr[1]); 
      Listbox3.items.add(adr[2]); 
    end; // for i
  finally
    sl.Free;
  end; // try
end;					

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if FileExists('test.txt') then 
begin
  sl.loadfromfile('test.txt');
  ...
  ...
end else ShowMessage('Datei nicht gefunden');