If you download the IPP samples 7.1.1.013, you receive precompiled binaries of the Picnic.exe (32-bit) sample application, using IPP 7.1 libraries.
I was testing a bug in my app, using IPP 7.1, that seemed to be always saving to Jpeg2000 losslessly, so I wanted to verify with Picnic, but it will not save Jpeg2000 at all. The output is a proper Jpeg file.
It seems Intel did not test Picnic before shipping, or that I have a bug in my system I havent found yet.