to have a comfortable file managing on sd card I made a http server for Arduino and published the following libs:
for Arduino Uno and Mega: https://github.com/tilos/AtMegaWebServer
for Arduion Due (there are a few differences) https://github.com/tilos/DueWebServer
there is a compatible client for Windows https://duinoexplorer.codeplex.com/
and MacOS https://duinofinder.codeplex.com/
The Mac Duinofinder may need a mono develop lib (I'm not sure. I wrote this with MonoDevelop and as far as I know it needs
a lib that comes with the IDE ? Maybe someone finds out).
So, I hope you like it.