[wp-testers] What are these files?

[headsetoptions.org]

Can you specify which date this build is from? Can not find in my latest files. Irrespective off, it appear to be a residual file that somehow managed to get into the zip, delete it. 

http://www.headsetoptions.org

http://www.mandarinmusing.com

--- On Mon, 6/16/08, [BLT]FQX <qfuxiang at gmail.com> wrote:
From: [BLT]FQX <qfuxiang at gmail.com>
Subject: [wp-testers] What are these files?
To: wp-testers at lists.automattic.com
Date: Monday, June 16, 2008, 7:43 AM

core.11834 and core.25957 are in my wordpress root folder, each is 18836 KB.
 I don't know where are they from!
My wordpress is the lastest SVN of 2.5.
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