filenames with spaces

Say I'm trying to download a filename with a space, for example: FILEWITH SPACE.TXT
using java:
String[] fileinfo=ftp.dir("FILEWITH SPACE.TXT",true);
I'm pulling from different servers and it seems to work ok on a Unix type remote machine, but on a WindowsNT, I get an error like the following:

com.enterprisedt.net.ftp.FTPException: FILEWITH: The system cannot find the file specified

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