http://pcsupport.about.com/od/tipstricks/a/execfileext.htm

The current DCC Ignore list is lacking quite a number of these Windows executable filetypes. I'm not going to say any of these are a big issue (at the moment) but the variety of executable file extensions has indeed expanded.

Eg: .CMD files are just .BAT files. *.bat appears in the ignore, but *.cmd does not... leaving an opportunity for abuse.

Well. At least I won lunch.
Good philosophy, see good in bad, I like!