[plt-scheme] Windows and file I/O

I hope really newby questions  are  tolerated here.

I'm trying to learn Scheme from the "Teach Yourself Scheme in Fixnum  
Days" and I'm at the part about file I/O. I mostly use the  Mac and  
everything seems to work there because Scheme accepts unix path  
names. But when I  tried to move a toy application to Windows and use  
forms like:

(open-output-file "C:\Documents and Settings\Chris Gehlker\My  
Documents\greeting.txt")

I get an "unknown escape sequence \D in string" error. How do I  
specify paths in Windows without Scheme interpreting the backslashes  
as escapes?

TIA
--
Egotism is the anesthetic that dulls the pain of stupidity.
-Frank William Leahy, football coach (1908-1973)

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