[racket] find-executable-path does not work on Windows for me

I have issue with find-executable-path function on Windows. I update
Windows's environment path to include the path to executable I want to run,
and verify that it is indeed added via run->cmd. However, when I call
find-executable-path on that executable, it returns #f. Even when I move
the executable to the current directory drracket is starting from, it still
cannot find the executable. Please help!

I'm using racket 6.0.1.

Thank you,
Mangpo
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