Thanks Duncan, Martin:

Please ignore my remarks about "top-level Windows context". I made a
mistake.
After correcting my mistake Duncan's suggestion worked, and the solution is
very similar to what the DLLpath argument of dyn.load() does: Sys.setenv()
can
be used to edit PATH so that Windows finds DLL's where you want them to be
found. (Well almost, because the windows search algorithm does not just use
PATH.)

Dominick

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