By default .GitIgnore is an embedded resource
Therefore, I do not think you can update it.
It has recently been updated with Visual Studio 2013u2, but it seems that ncrunch files are still part of the default ignore. I suspect that a newer version will be included in 2013u3 or, possibly, as an interim update. Until then, you will need to manually install the gitignore files or create the default gitignore in your user profile .
jessehouwing
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