Keyboard not found - using DUE

Please help me programming an Arduino board so that it acts as a USB-HID and presses the 'h'-Key every 60 seconds.

I have a DUE R3 board after finding out that flashing my UNO to get HID-capabilities is too complicated for me. Still, it doesn't work!

I set the IDE to Duemilanove. I always get the message when I try to veryify:

error: 'Keyboard' not found. Does your sketch include the line 'include <Keyboard.h>?

Of course it does. Need support under Windows. Thanks!

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Thank you!

I think this was it. At least I'm one step further now.