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And the .Net installer? If you're using the .Net standard library, it's reasonable to assume .Net is a prerequisite.

Silverlight contains a large subset of the .Net Framework in that 5Mb install. You don't need (and it can't use) the full .Net Framework.

Didn't know that, thanks! 5mb is indeed quite reasonable.

Looks this has now been addressed with .Net 4.0. It's back down to 48MB.