It is an additional function plug-in of the file management application "File Manager" made by Buffalo.
Please install "File Manager" before using this function.
"File Manager" can be obtained from the following link.
https://play.google.com/store/apps/details?id=jp.buffalo.filemanager

After installing the plug-in, devices that do not support exFAT format will be able to access USB devices formatted in exFAT format.
* Only available if your device supports the USB host function.
For details of the function, refer to the help from the following link.
http://buffalo.jp/support_s/guide2/manual/filemanager/a/99/en/pc_index.html