Checked.

Excellent!!! working perfect.

Tested with a real pseudo-nt map from mapear.
1-Using your extractor version 3,
2-then joining the files with GMapTool as a non-nt img (short header in options),
3-then opening it with GPSMapEdit and saving as a *.mp format without any problem or error.
all working perfect.
same result as the "manual extraction", EXACTLY the same output as a *.mp map in both cases.