Do you need to specify a full path? I think you can just get away with saying 'nmake.exe' as long as it's in your PATH.
Update: I just checked my config and my nmake.exe is in C:\Windows and the full path is in CPAN\Config.pm:
'make' => q[C:\WINDOWS\nmake.EXE],
In reply to Re: cpan on Windows - make.exe fails with directory white spaces
by grantm
in thread cpan on Windows - make.exe fails with directory white spaces
by Heidegger
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