OliThink 5 question

[Anonymous]

At http://wbec-ridderkerk.nl/ under the "News" link, there is this entry:
06/11/2004:

Updated: OliThink 5 Pre-Alpha 3 (also source!) Download: OliThink

The download link leads to the OliThink page at http://home.arcor.de/dreamlike/

Where i see this download:

Download OliThink 5 PreAlpha (26kb) Vers. 5 PreAlpha]

After downloading and unzipping this zip file, i see a OliThink.exe and a OliThink5prealpha.exe. What are these two engines? Which is the updated OliThink 5 Pre-Alpha 3? Are they both the same engine?

Both engines identifies themselves the same way in the Arena debug, as "Chess - OliThink 5".

Regards
Dave