Well, here's how I'm doing it.
Make a map in your custom_stories folder. In that folder, create a folder called "maps". Then open notepad and write:
<Main
Name="Custom Story Name"
Author="Author Name"
ImgFile=""
StartMap="Name of your .map file (With .map at end, Example: mymap.map)"
StartPos="A start position for player. Can be left blank"
/>
Save it as "custom_story_settings.cfg" in the folder you made (not "maps")
Then make a new notepad document and write:
<LANGUAGE>
<CATEGORY Name="CustomStoryMain">
<Entry Name="Description">Description of your custom story.</Entry>
</CATEGORY>
</LANGUAGE>
Save as extra_english.lang (also in your folder)
Then place ur maps & hps files (if you got scripts) in "maps" folder and it should pop up in game.
Creator of The Dark Treasure.