Update: the anindya.com post linked above includes at the bottom a collection of "fixed curl extensions" (his words, not mine.) Sure enough, the php_curl-5.4.3-VC9-x64.zip download runs just fine on my system.
So it seems to me this really was a straight forward case of there being a problem with the included version of curl in the 64 bit package, and the fix is to download and ins
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