This is precisely one of the major reasons I (and I'm sure many/most others) have strongly considered (or already did) re-format the eMMC with something not M$-compatible. I haven't done it, but this is just a reminder to me--and should be to everyone else--that perhaps it's time to do it, and do sharing with something that doesn't keep the executable perms or the like (is there a way with Samba et al?).