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procedure GetAllFiles(Path, ExtMask: String; List: TStrings;
  SubFolder: Boolean);
var
  Attrib, i: Integer;
  Search: TSearchRec;
begin
  Attrib := faArchive + faReadOnly + faHidden;

  if Path[Length(Path)] <> '\' then Path := Path + '\';

  with TStringList.Create do
  try
    CommaText := ExtMask;

    for i := 0 to Count - 1 do
    if FindFirst(Path + '*.' + Strings[i], Attrib, Search) = 0 then
      repeat
        List.Add(AnsiUpperCase(Path + Search.Name));
      until FindNext(Search) <> 0;

    FindClose(Search);
  finally Free end;

  if SubFolder then
  begin
    if FindFirst(Path + '*.*', faDirectory, Search) = 0 then
    begin
      repeat
        if ((Search.Attr and faDirectory) = faDirectory) and
          (Search.Name[1] <> '.') then
          GetAllFilesEM(Path + Search.Name, ExtMask, List, SubFolder);
      until FindNext(Search) <> 0;

      FindClose(Search);
    end;
  end;
end;                    

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GetAllFiles('c:\programme\', '*', ListBox1.Items, False);                    

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var
  tmpList: TStringList;
begin
  tmpList := TStringList.Create;
  GetAllFiles('c:\programme\', '*', tmpList, False);
  ShowMessage(tmpList.Text);
  if tmpList.Count > 1 then
    ShowMessage(tmpList[1]);
  tmpList.Free;
end;