Report error/warning if missing files in project/solution in Visual Studio 2012 / 2013

Question

Visual Studio no longer supports macros, so the answer in the following question is only valid for previous releases:

Report error/warning if missing files in projec

Answer 1

With regards to breaking the build when missing files are detected, the closest I have found is to cancel the build (in conjunction with the OnBuildBegin event) using the following:

DTE.ExecuteCommand("Build.Cancel")