Open expansion maps in Editor

Hi, I'm trying to open expansion maps in the editor (.pdb files, e.g. luko.pdb, or roid.pdb) but the editor crashes.
Loading the main game map or ice&fire map works fine, but the rest of the expansions don't seem to work.
The reason I want to load the maps is that I want to see the quests details. I'm playing Asteroids I at the moment, which has some really cryptic quests and I don't want to ask in the forums every time, since not a lot of people play it anyway.
Thanks for the help!
Loading the main game map or ice&fire map works fine, but the rest of the expansions don't seem to work.
The reason I want to load the maps is that I want to see the quests details. I'm playing Asteroids I at the moment, which has some really cryptic quests and I don't want to ask in the forums every time, since not a lot of people play it anyway.
Thanks for the help!