Due is not listed on my IDE how do I program it?

my name john laramie i've been electronics tech 35 years done bit of programming
in dozen languages seems 1 of hardest, there flash action script.


i got due 84mhz 32bit 1 2 dac outputs.  built stereo amp 2 lm386's , got sketch ready, go load , surprise, due not on list of boards!!

i'm running win7 on compatable laptop,
i'm using ide versions 1.0.6 , 1.6.3 , both fail list due.
the due comes on device manager arduino due programming port com15,
i watched driver installed, know computer knows it.

i've read instructions , seem due selected list of boards.
but it's not there on list.
can tell me i'm doing wrong?

here screen shot of list i'm talking about.

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