Carbide.c++ supports the macro _CARBIDE_CPP_ during the preprocessing of .mmp and .inf files. Use this macro in those files to include Carbide specific files during the preprocessing stage that are never recognized outside of the Carbide.c++ IDE.
For example within your .mmp or .inf file:
#ifdef _CARBIDE_CPP_
// Add any makmake statements that you want specific to Carbide.c++ only
#endif