I’ve never had problems with InCD and it works fine on my 3500. Mount Rainier support is not necessary to use InCD. But to use a Mount Rainier formatted RW on a non Mount Rainier drive requires extra software.
From the InCD help file: “In order to be able to read discs in Mount Rainier format on drives that do not support this format (CD-MRW/DVD+MRW), you will need a so-called remapper (the ‘InCD Reader’). It is not installed as part of the InCD installation process, so you will need to install it separately. Depending on the operating system in use, you may also have to install InCD.”
If the RWs you’re trying to read were formatted on the Sony (which supports Mount Rainier) you’ll need to go to the Nero website and download InCD reader.