windows update ident files maybe?
If you don't know what an entry if for and can't find any information on it I would strongly suggest not manually "optimising" you registry
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Just a quick look at a line in one gives a big clue where it came from
Quote:
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ServerUrlEx="http://download.windowsupdate.com/v6/windowsupdate/a"
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So I'm thinking they are files related to Windows Update, possibly holding information on the your settings for Windows Update itself (language etc)