[plt-scheme] stupid question about Windows path

path don't work (cannot open file) if path include spaces
this is dont't work under Windows:
(without spaces - all OK)

(define p "F:/ALL_MINE/CYBER/PROJECTS/PLT SCHEME/x.mxml")
(write-to-file "XXX" p #:exists 'replace)


tried \" .... \" (doublequotes), tried \\ , tried escaping space (\u20)
have read manual but may be I miss something