Been a long time since I used it but I think there's an old windows app you can install to access memory cards. Can't think of what it was called, there was something like c-xbox tool but I don't think it was that. If you look at my YouTube page there's some old guides on how to use a USB stick as a memory card for xbox, fairly sure that has all the details.
The YouTube page is /totalxbmc but you can also find the info on the noobsandnerds site. Sorry I'm only on phone at moment so unable to give proper advice /links
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