XnView Software

I today wanted to print a psd file with 12 layers (pictures and text).
The preview in print dialog is undetailed and show very big pixel.
My psd file has a very high resolution (10.000 x 8.000 pixels).
Other files (png, jpg, etc.) does not have any pixel problems.

If I use a single layer psd file, everything is fine!

I think the answer is probably that either there are different versions of the PSD format as it evolved, and that XnView software only supports the original or other early version, or that support for the format is not complete..