Any feedback on windows installer for Maxima 5.9.0.9beta2?

Vadim V. Zhytnikov wrote:
>> David Billinghurst wrote:
>> 
>> I see there have been 26 downloads of the windows installer.
>> Has anyone tried it?
> 
> I see just one problem with Maxima 5.9.0.9beta2
> on Windows.  Describe dosn't work both with
> xmaxima and maxima.bat
> 
> Maxima 5.9.0.9beta2
> 
> (%i5) ? diff ;
> (not found "dir")
> Maxima encountered a Lisp error:
> 
>   Error in CATCH [or a callee]: Cannot open the file NIL.
> 
> Automatically continuing.
> To reenable the Lisp debugger set *debugger-hook* to nil.
> (%i6)

I have had a quick look at this, but haven't found the problem.
The info files are installed, and the path seems to be set correctly.

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