PRB: MASM Code Using CMACROS.INC Does Not Build Correctly

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MASM has changed considerably from version 5.1 to versions 6.x; the changes to the assembler include the removal of the second assembly pass and additions or modifications to the behavior of assembler directives. A complete list of the differences can be found in the product documentation of MASM versions 6.0 and later. Because of these changes, versions of CMACROS.INC compatible with MASM 5.1 are not compatible with MASM 6.x; likewise, versions of CMACROS.INC compatible with MASM 6.x are not compatible with MASM 5.1.

Most of Microsoft's development products include a version of CMACROS.INC that is compatible with MASM 5.1. Use this version of CMACROS.INC with MASM 5.1. If MASM version 6.0 or later is being used, use the CMACROS.INC that comes with it instead of the one that comes with the development product.