Whats creating memorydump.dmp?

i have a file, in the root, of my Server 2008 (not R2) and its huge, and i cant delete it!
c:\memorydump.dmp ----- 2.5GB
Whats creating it? and Why cant i delete it?
i've fiddled with Startup and Recover - dump file options, but that makes no difference. (i've left it on Small(64k) and rebooted after each change i tried).
i've tried using ProcessExplorer, but that just tells me its a file, References:3 Handles:1. I even tried CloseHandle to kill off this file, and it does disappear - until next reboot.
Any tips please...
UPDATE one year later, still no answer...
This file "memorydump.dmp" is created on restart.
It cannot be deleted - because it is "open in another program".
This happens in normal- and safe- modes.
It cannot be unlocked - using various 3rd party software.
It cannot be looked at - using BlueScreenView or similar, as its 'in use'
The minidump settings and location are default "%systemroot%/minidump"
I see nothing in SystemProperties, nor EnviromentVariables, that refers to this
location or filename.
It is NOT created during BSOD, it is created EVERY boot.
I#ve never come across this before, and i'd like to know whats causing it, and how to remove it.

Since you have mentioned the below things
Whats creating it?
Memory dump file records the set
of useful information that may help to identify why your computer has stopped unexpectedly. ( For an example your computer might suddenly reboot,shutdown without any prior notice or displays a blue screen. Before shutting windows writes the log in .dmp which
will later help to analyze the root cause of the problem.)
Please create a boot logging with using process monitor this will give you clear hints while the system is booting
http://www.msigeek.com/6231/how-to-enable-system-boot-time-logging-using-process-monitor-tool
and Why cant i delete it?
Technically speaking you should not get any issues while deleting. How ever you the process monitor to find the root cause of the problem. or restart your computer in the safe mode and delete it.
Again Please run the Process Monitor and see whats blocking it to delete
http://www.arabitpro.com

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