/usr/share/racket/collects/ffi/winapi.rkt is in racket-common 6.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #lang racket/base
(provide win64? winapi)
(define win64?
(and (eq? 'windows (system-type))
(equal? "win32\\x86_64" (path->string (system-library-subpath #f)))))
(define winapi (if win64? 'default 'stdcall))
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