I took a screen shot from Mint Linux and put it on a USB stick. On my Windows 7 machine when I try to upload it to ImageShack, when I select the file it says "The file name, directory name, or volume label is incorrect". When I try to open it with Windows Photo Viewer it says that it was either deleted or in a location that is unavailable. It appears as 32 kb. I can't rename it. What causes this? Are there often problems transferring data files between OSs?