WMI = Windows Management Instrumentation
Allows you to quickly and easily access Windows system information through any scripting language or normal language.
Why its making a permanent log I dont know 
I didn't read anything in that specified a reason to keep a continuous log in a file unless somebody wanted to write a script looking for a particular event and see how many time it comes up... probably most useful for debugging ... why its in a production system I don't know.
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