What's not clear to you. The card is full, the copying process is not complete, so the map file is unreadable.
But.
You have viruses on your PC (most likely, I'm almost absolutely sure). Or card/file structure is damaged.
You will need to completely reformat the card on a clean computer, if card is physically/electronically correct.
If not, simply buy another one. 8GB is enough to be of good quality.
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