9.1 I’m trying to set up a MFC application under Microsoft Visual C++, but I get error messages relating to precompiled header files, what to do?

This problem is very likely not related to ChemApp, but to an incorrect setup of support for precompiled header files in your project.

One remedy is to open your “Project Settings” dialog, tab “C/C++”, category “Precompiled Headers”, and choose either “Not using precompiled headers” or “Automatic use of precompiled headers”.

Both settings should work.