If you have one: it must be in the same directory as your solution file (.sln) with the same base name.
If your solution is C:\projects\acme.sln , then it should be C:\projects\acme.ncb .
But: Starting with Visual Studio 2010, it no longer uses the .ncb system. Instead, it creates a file with the extension .sdf.
So you should probably look for C:\projects\acme.sdf .
See IntelliSense / Viewing Options in VC ++ 2010 for more details.
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