Windows Script 5.7 for Windows 2000 (Yeah, I am surprised by this one myself…)
Windows Script 5.7 for Windows XP
Windows Script 5.7 for Windows Server 2003
I do not know what additional functionality this new version provides. I have not seen this updated on WSUS either. EDIT - It's worth noting the there is no Vista update, because Vista already have WSH 5.7.
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But I'll note this for the XP box.