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procedure TForm1.loadClick(Sender: TObject);
var
a,b:integer;
loadfile:textfile;
string1:string;
begin
if opendialog1.Execute then
begin
 assignfile(loadfile,opendialog1.FileName);
 reset(loadfile);
 a:=1;
 while eof(loadfile)=false do
 begin
  readln(loadfile,string1);
//gekürz, da Programm für wettbewerb, ist auch unwichtig;
 closefile(loadfile);
end;
edit1.Text:=inttostr(a-1);
format1;
end;					

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uses
  ...;

[STAThread]
begin
  ...
end.