Thembraneman,
I was facing the same problem, but I inserted the micro SD memory card into my computer via a card adapter and renamed the image files to .jar and the corresponding .(nothing). You can then place the card back in the phone and try copying as Portgasdace
suggested. It WILL work.
Infact, I copied the renamed backup file to my computer, and took all the names from there, then renamed the dummy image files and copied them all to the memory card. Then I copied them to corresponding Games and Apps folders as recommended and it worked
flawlessly. I reclaimed so much space!
(NOTE: This above method can let you do the whole process without using BlueFTP, although I did try using it, initially, but since I can copy the memory card backup file to computer, it is more convenient for copying the names of the apps and games you want
to delete. Also, I HAD to use the computer to rename to .JAR since BlueFTP was giving error while renaming.)