I am not familiar with PED, but if you can copy from your computer to a card, I would think the reverse to be true. It appears that PED is for Windows only. If you open Windows Explorer (I do this by holding the Windows key on the keyboard and the E key) do you see PED-Basic, when the USB cable is plugged in? If so, I think you can right click on the file you want. Select Copy, then I would go to Desktop and paste it there. I would make a new folder somewhere on the Documents folder and then move it there.
There is an image on page 12 of the link Gay gave. It shows places the reader looks for files. I definitely would not save the copy in the PED-Basic folder.
Another suggestion would be do a search (can be done from Windows Explorer) for the file name (without the PED plugged in).