A5 paper support for PrimoPDF
When you download the Free PrimoPDF software from http://www.primopdf.com you can't print a PDF as A5. However with a few modification to the .PPD driver descriptor you're good to go.
The PPD file is just a PS (Postscript) file and if your know what your doing any papersize can be added to it. Diff the original with my version to see how its done.
After installing PRIMO replace the file primopdf.ppd in C:\WINDOWS\system32\spool\drivers\w32x86\3 with the one I've supplied here.