GMapTools gives error

Program start.

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Reading file D:/temp/DR 5.14/gmapsupp.img.
Wrong header (DSKIMG GARMIN), file D:/temp/DR 5.14/gmapsupp.img.

File: D:/temp/DR 5.14/gmapsupp.img, length 630407168
File format errors (3)

There were errors, result is faulty.

End.
Any ideas?