Jpegs saved via Mac won't open in Windows

I use Nikon transfer on my Macbook pro and save my pictures to a Western Digital passport external hard drive (that I also use in Windows applications). When I attach the drive to any Windows pc/laptop, I can only see and open whatever was created on Windows. I can't see or find the jpegs until I move back to my Mac. Any suggestions?

Step one would be to try them on a local windoze box. That should give you some indication of what might be wrong. Alternatively, try the Terminal command gzip. Read about it by typing in man gzip in a Terminal window and then pressing the return key.
27" i7 iMac (Mid 2011) refurb, OS X Mavericks (10.9.4), ML & SL, G4 450 MP w/Leopard, 9.2.2

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Jpegs saved via Mac won't open in Windows

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