I may be mistaken, but I believe that this "NVRAM Pro" title may be what Alex Werner was referring to in this (LINK) thread.
Here are a couple of excerpts from that thread:
MaxTheVool wrote:Yes indeed. There was an Opera title called something like "3DO toolkit" or something like that which let you see what files were on your memory card and so forth and do other system-y things. It was written by the same guy who wrote Mercury.
MaxTheVool wrote:No, I'm thinking of an Opera (M1) title that I'm 95% sure was actually released. Except that some googling doesn't find it at all. Maybe it was close to release, so I saw a finished version, but then it never actually made it out?
Below are some screen captures of the functions. It includes the storage manager v2.0.
It allows you to test NVRAM, completely erase NVRAM, create custom files, and fill in NVRAM.