How to open custom editor for property in PropertyGrid from the outside?

Warcraft 3: Frozen Throne - World Editor problem...?

• I've downloaded custom made maps online, and wanted to look at them in world editor, just to see how they are (I got different versions of the same type of map, and wanna know which is best without loading each in the game). I'm able to load and see some of them in world editor, but I have problems seeing multiple maps. Some, however, won't load. Editor will tell me that it's unable to load, saying, "unit data is missing or invalid." For others, it'll say the same thing, except with trigger data, or something else. Is there anything I can do to fix it so I can properly look at the map, or not?

• Answer:

  They are protected. Read: http://www.3ice.hu/blog/protect-warcraft-maps/ You can unprotect them, but you will never be able to see the triggers or units. The "* data is missing or invalid" errors and their explanation: * unit: the war3map.w3u file was deleted or overwritten in the map. * trigger: the war3map.wtg file was deleted/overwritten * or something else: war3map.ext