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PictureURI:Array[1..4] of string;                    

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procedure TMainForm.SetStyleSelectPicture1_ButtonClick(Sender: TObject);
var
  fx:string;
begin

  if OpenPicture_Dialog.Execute=true then begin
    fx:=OpenPicture_Dialog.FileName;
    if fileexists(fx) then
      PictureURI[1]:=fx
    else begin
      Application.MessageBox('The file you selected could not be loaded!','File Error!',32);
      exit;
    end;
  end;


end;                    

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procedure TMainForm.SummaryCompile_ButtonClick(Sender: TObject);
var
  i,_i:integer;
  f:textfile;
  fn:string;
begin

  ...
  SummaryStatus_ChecklistBox.Items.Add();

  if fileexists('rarsfxfile.exe') then deletefile('rarsfxfile.exe');

        copyfile('.\..\rar\rar.exe',pchar(mw_dir+'\rar.exe'),true);
        copyfile('.\..\rar\rarsfxfile.exe',pchar(mw_dir+'\rarsfxfile.exe'),false);
        copyfile('.\..\rar\test.file',pchar(mw_dir+'\_test.file'),false);

  if not fileexists(mw_dir+'\rar.exe') do begin
                showmessage('dateien wurden einfach nicht kopiert.
    application.terminate;
  end;

  ...

end;
end.                    

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procedure TMainForm.SetStyleSelectPicture1_ButtonClick(Sender: TObject);
begin
  if OpenPicture_Dialog.Execute then
  begin
    PictureURI[1] := OpenPicture_Dialog.FileName;
  end;
end;