SC2Mapster

I think that's quite easy to rebuild.
Mine contains that:

<?xml version="1.0" encoding="us-ascii"?>
<Components>
<DataComponent Type="text" Locale="enGB">GameText</DataComponent>
<DataComponent Type="info">DocumentInfo</DataComponent>
<DataComponent Type="mapi">MapInfo</DataComponent>
<DataComponent Type="trig">Triggers</DataComponent>
<DataComponent Type="terr">t3Terrain.xml</DataComponent>
<DataComponent Type="plob">Objects</DataComponent>
<DataComponent Type="gada">GameData</DataComponent>
<DataComponent Type="regi">Regions</DataComponent>
<DataComponent Type="attr">Attributes</DataComponent>
</Components>

Edit:
Yep, I added back the file and the map could be opened again.

Only for triggers, you could still have opened the map to watch data and terrain

Today I published the new version of Crush Company and when I tried to open the map file inside my b.net cache I found this error:

Unable to load file (Core: file not found): ComponentList.SC2Components

I suppose it works only on new published maps and it should be easy to hack but at least it protects the map from noobs opening it :D

Can you test this too plz? :D