I copied some files from my computer to a sd card using a card reader. Then inserted the 32gig sd card to the Acer Iconia A500. I can see the files using Astro but when I attempt to run them, I get the error can't open file:///mnt/external_sd/<file_name> If I hook up the Acer Iconia A500 to my computer and move the file over using the USB cable and run it on the A500, it works fine. It seems like running copied files using a card reader will give me this error only. Does anyone have this problem? Does anyone know a solution on how I can read copied files that was copied from a card reader?