yep.. then you prolly need to manually edit the file, but be careful do not mess with the disk/partition info or you wont be able to get back into windows
here's mine which boots straight into windows, which you should be able to use as an example
but do not copy my disk/partition info
the parts that matter for you are
multi(0) and
\WINDOWS="Microsoft Windows XP Professional" /fastdetect
Code:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect