Daixiwen, I have a bigger problem than I thought, because my SOPC builder will not generate a *.html file... ,but you are right, regarding to the SOPC handbook there must be a file with the html extension. I have checked the *.ptf, and the confusion is, that the timestamp in this file doesn't match with the timestamp in my SOPC gui.
Jake thank's for your reply, I have built a completely new testproject and a new project folder on an other harddrive. I have controlled the timestamp in my *.ptf file and the the timestamp in my system.h file. They were equal... so I think it is the same ptf file, int't it?
The next step I would try, is to download and to install the new Quartus2 and Nios2 software. I hope that will solve this problem. You will hear from me...