Here the source updated with the changes from 0.0.3:
https://www.dropbox.com/s/b1dofgp2ntsnvji/Switch Gamecard dumper + WAIN v0.0.3.zip?dl=0
Note: WAIN uses 2000000000 (1,86 GB) instead of 2147483648 (2GB), my version uses 2GB, see "dumper.h"
Tested and working with Super Mario Odyssey (8GB rom).
And before someone asks, no i don't know how to add cart2 support.
Note: if you get "MountGameCard failed" then your switch is on FW 1.0.0-2.3.0, the minimum required firmware for
this tool is 3.0.0, Nintendo changed some apis or permissions in 3.0.0 and so some code is broken on older firmwares, this has nothing to do with exfat.
not work in fw 3.0.0
FAIL 320002