GetFileType() takes a HANDLE, not a pathname. So passing it the
pathname of the agent named pipe would never have worked at all.
I hadn't noticed, because the only call to that function logical-ORs
its return value with that of wm_copydata_agent_exists(), and the
latter _does_ work.
So if you're running true Pageant, which presents both IPC interfaces,
then there's no problem. But if a Pageant-emulating system wanted to
present only the named-pipe version, then we wouldn't have detected
it. Now we should do.
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