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What is the purpose of:

C:\WINDOWS\system32\config\Software.log

How to open it.

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The file contains the journal of the HKEY_LOCAL_MACHINE\Software hive. If the machine crashes while in the middle of updating a registry key in that hive, the .log file is used to recover the registry. I would recommend not messing with the file unless you know what you are doing.

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I have a lot of disk writes to this file in my Exchange2013 VM... do you think this is necessary? – Tobia Dec 1 '15 at 10:40
    
I'm not current on Windows, but having said that, I would be very surprised if normal system activity included a lot of writes to that log. Do you know the disk is good (if the drive is seeing errors, you can see a lot of writes)? Do you know what process is issuing the writes? – Fred Dec 1 '15 at 21:17

It is part of your Registry, you cannot open it directly

http://support.microsoft.com/kb/256986

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