Description
Due to a problem in the Quartus® II software version in 14.0 or later, if you click the Help > PDF Tutorials > PDF Tutorial for VHDL and Verilog HDL users, you see a Can't launch default web browser error.
Resolution
To work around this problem, open the \quartus\common\help directory to view the pdf documents. For example, C:\altera\14.0\quartus\common\help.
This problem is scheduled to be fixed in a future release of the Quartus II software.