[plt-scheme] View Keyword Docs in Emacs (Quack mode)

It doesn't work for me. Every time I try to look up the documentation for a
function name, I put a cursor on it and run quack-view-keyword-docs and it
says "Sorry, no documentation found for keyword.".
I set an environment variable PLTHOME which points to my d:\DrScheme folder.
Under the folder I have doc directory with documentation.
How can I make it work?

Thank you,
Andrew
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