With RPE 2.0.1 you can specify .docx as the extension for the output documents regardless of the stylesheet you are using. With 2.0 and older the generation process would fail if the stylesheet contained macros since .docx is a macro free Word document format.
To avoid this RPE 2.0.1 will remove all macros before saving the .docx file. This also means that any macro specified to be executed for the output will be ignored if the output extension is .docx. If you need macros in your output document you need to use one of the macro enabled document formats .doc or .docm.