Right now I'm dual booting between windows and ubuntu (using Wubi). How can I grab some files from my Ubuntu root drive within windows?
You would require a ext filesystem driver for windows to access ubuntu files from windows.Download ext2 driver from the below link:
Unfortunately, I don't think you can. Unless you use a 3rd party program, Windows can only read NTFS, FAT, or FAT32 type drives. Ubuntu is installed on an ext3 or ext4 type drive. This is why Ubuntu is more popular amongst giant businesses, it can use hardware more effectively than any other kernel and operating system.