So far the extensions I have used have come in source form and they were compiled on install. But you should at least check if it compiles on any other platform than Windows and if it doesn't flag it...

Now playing: AC/DC Black Ice
Now reading: Wikinomics
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Editors/IDES/tools used today: Vi, Gedit, Emacs, Bluefish, Visual Studio (BizTalk), Notepad,...