What's winsxsmanifestcache(something)_blobs.bin?

Glenn writes: “What is the c:\windows\winsxs\manifestcache\6.0.6001.18000_001c50b5_blobs.bin file and why is it taking up 156Mb on my hard drive? Do I really need a file this big?” That file is used by the Windows Update mechanisms in Vista.  It acts like a cache and is capped at a certain size, but it’s safe to delete.  The…

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