Using the SD: protocol adapter. - FujiNetWIFI/fujinet-firmware GitHub Wiki

The SD protocol adapter allows the FujiNet Network device to access files stored on the SD card, if one is inserted.

DeviceSpec

When specifying a path to a file on the SD card, The following form should be used for a file in the root of the SD card.

N:SD:foo.xex

This means when accessing folders, you should extend this to:

N:SD:bar/baz/foo.xex

-Thom