Works fine! So for more 20 points that is very easy :)

No problem but...
Something curious in the Save point text help file it's written
< In the dialog box, type a name for the file including some extension like .txt, .csv, .xyz; e.g. outline.txt

but there only the normal export file window so works fine in 3Dm ;)

and for the import point text help file it's written nothing
but import file window is .txt, .csv, .xyz and hopefully *.*