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write(f,Edit1.Text);
write(f,'  ');
write(f,Edit2.Text);

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assignfile(f,'datei.txt');
reset(f);
writeln(f,Edit1.Text);
closefile(f);

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uses ShellApi;
...
begin
  exeName:='{Hier der Name der Anwendung}';
  param:='[{Hier die Parameter rein}]';
  ShellExecute(Application.MainForm.Handle,NIL,PChar(exeName),
             PChar(Param),PChar(ExtractFilePath(exeName)),SW_SHOWNORMAL);

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Memo1.LoadFromFile();

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...
var datei,f : textfile;
...
datei := '/pfad/zur/datei/datei.txt';

assignfile(f,datei);

reset(f);

while not EOF(f) do
 begin;
  readln(f,zeile);
  Memo1.Lines.add(zeile);
 end;
...
CloseFile(f);