Not recognizing Excel sheets

[trythesefirst]

http://wdc.custhelp.com/app/answers/detail/a_id/3644/session/L3RpbWUvMTM2MDU2MTI3Ny9zaWQvNzFudzV6aWw%3D

Check the link for supported files.

If still not working, do a manual copy paste back up.