[racket-dev] Windows test bundle 29M vs. 47M for other platforms?

On this page

http://pre.racket-lang.org/release/installers/

the reported size of the Windows installer is 29M, vs. about 47 or 48 M for other platforms.  I see that this was true of the 5.0 release as well, so this is probably expected, but I'm curious: why is this? Is it just that the other platforms are distributed uncompressed and rely upon dynamic compression?

John

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