The .ncp file is Visual Studio is an internally maintained file
that controls IntelliSense, amongst other things. IntelliSense is
the popup window that shows you syntax and arguments for functions
and other things. It is safe to delete, so long as you are not
running Visual Studio. Sometimes, in older versions of Visual
Studio, problems with IntelliSense can be fixed by deleting the
.ncp file and the restarting.