Default output extension not .dll?

I'm compiling a source to be a dll, but by default it makes it an .exe.  What am I doing wrong?  I thought /dll would make the extension .dll.

Here is my command line in windows.

ifort f6070.for @props.txt

where props.txt contains:

  /debug:full /Qopenmp /fpe:0 /real_size:64 /integer_size:64 /names:lowercase  /iface:cref /I:"..\..\x64\Current" /MD /iface:mixed_str_len_arg  /libs:dll /threads /include:"..\..\x64" /assume:byterecl /extend_source:132 /Od /traceback  /INCREMENTAL:NO /link /LIBPATH:"..\..\Dlls_x64""..\..\x64\ProcessModulesDll_16.lib""..\..\astap\x64\debug\astap_16.lib""..\..\x64\procesCur16.lib""..\..\x64\utilityCur_16.lib" /MAP /MANIFEST /dll

Thanks

Dave