MC9900 wont convert all the files to .jbf files to see it


Hi I have a MC9900 When i try to transfer designs from my computer via usb the machine only displays maybe 5 out of 10 designs and doesn't seem to recognizes the other. Any ideas. 

I have reformatted , reloaded  redownloaded  the designs several times no change. It recognizes the same files only every time.

Please help

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