How to get versions of files (exe's and dll's) which are included to Inno Setup installer exe file?

As in topic, is it possible? And, I want to display them on one page of installer if parameter (e.g. parameter passed to exe file) is set to true.

I know how to display some page:

if dev then
    PageWersjePlikow :=
        CreateOutputMsgMemoPage(
            1, 'Wersje plików zawarte w     instalatorze',
            'Lista plików niewidoczna dla klienta',
            'Pliki:', 'TU WPISAĆ WERSJE PLIKÓW');

I have some ideas, but every idea is based on .txt file built while compiling exe installer and then read from it...

Use GetVersionNumbers or GetVersionNumbersString support functions.

The GetVersionNumbersString returns version in format Major.Minor.Rev.Build.

If you need a different format, you need to use GetVersionNumbers and format the version components, the way you need (like Major.Minor.Rev):

function MyGetVersionNumbersString(
  const Filename: String; var Version: String): Boolean;
var
  MS, LS: Cardinal;
  Major, Minor, Rev, Build: Cardinal;
begin
  Result := GetVersionNumbers(Filename, MS, LS);

  if Result then
  begin
    Major := MS shr 16;
    Minor := MS and $FFFF;
    Rev := LS shr 16;
    Build := LS and $FFFF;
    Version := Format('%d.%d.%d', [Major, Minor, Rev]);
  end
end;