First off, there's no such thing as a stupid/dumb questions
I'm sure there are several ways to do it, here a just a couple off the top of my head:
microSD card from PC to NC
Dropbox
plug NC into PC, use as external drive
If you are booting from the SD and not the internal memory, you will need to use ADB or something similar if you are on windows as windows will ony see the first partition on the sd card. If this is the case use adb push and push to /sdcard/whatever
Or, if you have a linux box lying around you can use that to see all the partitions on the card. Then you can just drag and drop.