You don't open it in the normal way. To edit a BML file, you drag the BML file itself onto the converter tool. The command line box will briefly open then close and after you should see a new file with the same name but with the XML file extension instead. It also converts XML back to BML in the exact same process, drag the XML file to the converter, it'll create a new file called <FILE_NAME>_noconflict.xml (substitute <FILE_NAME> with the name of the actual file, e.g ALIEN_noconflict.XML) and rename it to what the original filename was in your game folder.
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