How to force Visual Studio preprocessor case sensitivity with #includes?

Question

If you have a header file named ThisIsAHeaderFile.h, the following will still locate the file in Visual Studio:

#include 

Answer 1

It is (used to be?) possible to create files with the same name but case differences on NTFS. Maybe someone with cygwin can verify this.

MSDN

Even then, however, it's impossible to access more than one of these at a time from a normal Windows application.