'nmake' is not recognized as an internal or external command,
  operable program or batch file.

I don't really know what the (above) reason is. Do you have
nmake 1.5? 1.6? What happens if you enter nmake -? into a
command prompt?
(mine says: "... Version 6.00.9782.0")

The intermediate files for the Inline build will be in
C:\Temp\herehere\_Inline\build\wma_txt_8d90, especially
the out.make will be of interest.

(I'll join tommorrow again, now it's time to go to sleep, L.T. is 23:19)

Regards

mwa