It seems that once you've mounted an ext2fs filesystem under Windows (XP) you can't unmount it without causing a kernel exception (and thus reboot).
Beware. (Tested with ext2fsd 0.22b on a real partition and a file image).
specifically the DISMOUNT ioctl causes a driver panic - if you comment that out, and move the DefineDosDevice up (after the LOCK_VOLUME ioctl) things work.
Also - it is important that there is a UNLOCK_VOLUME ioctl after the definedosdevice.
CreateFile - grab a handle to the partition
LOCK_VOLUME - prevent further activity
DefineDosDevice - remove map of partition to drive
UNLOCK_VOLUME - let VFS things can proceed
CloseHandle - close (last) handle to device
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