Dave, I followed your recommendation. This is the database folder accessed through General Options:
C:\Users\{username}\Evernote\
There are folders 'AutoUpdate', 'Crashes', 'Databases', 'Logs', but not 'Dict' (see attached).
I tried adding the folder myself, with a user.dic text file, but it is not being used by Evernote.
An added problem that I have is that none of my dictionary words save from session to session, and I've no idea why.