Hema use a cut down OziExplorer so easiest way I know to get oddball files across is using a full OziExplorer.
I haven't done it for ages but was easy peasy.
Import the desired .xxx file/s to Ozi on the PC and then load the 'imported' file/s from Ozi (.wpt .trk or .gpx or whatever you choose) straight on to the Hema SD card.
If you don't have OziE then maybe ask someone who does
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