For the RPi, the first partition is DOS, because it is used to prepare the GPU, whilst the second partition is the Linux operating system partition, it needs to be a Linux filesystem.
If you know what you are doing, you can create a smaller Linux partition, before installing, you would need to change the size in /usr/lib/raspi-config/init_resize.sh, (TARGET_END=$((8000000)) ) - but it is likely easier to use a special program under MSWindows to access the data, or just use a separate pendrive to transfer the files.