I knew I had seen the RMSDK version for Sony listed somewhere, but it turns out it wasn't for the T1, it's for the new Reader for PC/Mac software.
According this Sony T1 support page, the new Reader for PC/Mac software uses RMSDK 9.1
http://ec2-50-19-245-21.compute-1.am...d=99&mdl=PRST1
I'm guessing that means the T1 also uses 9.1 <sigh>