Export / Import Playlist

Simple question , but do not have a simple answer. My problem is next :

I have a created a playlist in Rekordbox ( I do not use Itunes ). Now I want to export this playlist to an external USB stick. So far so good.

On the another PC I only want to import this playlist in Rekordbox. Seems not possible , because during import Rekordbox ask for a *.m3u , *.pls or *.m3u8 file to import. But the export I made does not contain such a file of the export I made. I can not imagine that such a simple action is not possible ?

Do I miss something here ?

Regards,

Ollever