I emailed tech support on this issue, but they failed to answer my question, so I’ll give it a shot here in case anyone has an answer:
While Cubase 9 has some cool features, some of us may want to stick with 8.5 for a while to take advantage of plugins that might be blacklisted (although I am aware you can un-blacklist them in C9). But as part of the upgrade decision-making process, many of us want to first review whether all of our plugins in 8.5 are 64-bit. A few users offered ways to identify 32-bit vs. 64-bit, but I am looking for the best method to identify all of them - either within Cubase 8.5 or in the file-directory structure on my hard drive (i.e. plug-ins folder). Any suggestions proven to work?