Bug in command.com?

I'm using FreeDOS Beta8 (Official Release)
VER gives: FreeCom version 0.83 Beta 32 [Dec 03 2001]

Please, test Polski.bat from Polski8.zip
It's available at: 
1. http://hethome.cjb.net  as polski8.zip
2. ftp://ftp.gust.org.pl/.mount/TeX/GUST/contrib/GUSTPROG/polski8.zip
It runs properly on MS-DOS 6.22 and NOT on FreeDOS Beta8.
The following seems not to work:
- testing directory existance.
 INPUT: polski c: emtex
OUTPUT:
=========================================
Performs conditional processing in batch programs.
(...)
  EXIST filename    Specifies a true condition if the specified filename
                    exists.

Remove or rename C:\X directory
========================================
THERE IS NO C:\X directory on disk!

I look in source (polski.bat) and found the folowing lines that seems 
not to work under FreeDOS Beta8 (it works under MS DOS 6.22):
==============================
:TSTDIR
if exist c:\x\nul goto ERR3
=============================

ERR3 is simply label to message:
===============================
Remove or rename C:\X directory
===============================
There are in source other if exist/if not exist testings:
i.e.:
:TSTDRV
if not exist c:\nul goto ERR2

:TSTCLL1
if not exist %1\nul goto ERR6

etc.
==========================================

- Chris

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