Can anyone explain what is supposed to be going on on p.111 onwards of the DE0-nano user guide please? Trying to get the Nios2 example working...

I think the open file thing in the screenshot is just to look at the output of SOPC Builder (which doesn't even exist in the software anymore; this is a very old document). Just create and save the myfirst_niosii.v file and compile the project.

#iwork4intel