The file system type for NAS drives is ext2. If you want to transfer the data the best way to do it is to copy the data to a windows drive first while the NASLite drive is still in the NASLite+ box.
There is a utility called ext2fsd which can be found at
http://ext2fsd.sourceforge.net that might allow you to see the contents of the drive but it would need to be connected directly to the IDE connectors. You might be able to connect it to an external USB box but that depends on whether or not the USB box requires reformatting before you can use it. If it doesn't, then the ext2fsd utility should allow you to see the drive under windows (read-only mode).