tomasz: wouldn't it be better to do "label MessageBox dword at MessageBoxA" instead of additional import named MessageBox? I am not sure if macros handle this or declare two imports, but any way, my proposal should work nicer

You may be right. I still haven't decided for the best solution, though.

Also note that you would have to put this label inside "if used" block, as declaring such label "touches" the MessageBoxA symbols and makes the import entry for it. Perhaps some additional macro for making import aliases would be a good idea.

I did it by adding another macro - and this way there's now only one API directory instead of APIA and APIW.