Hi-- Those workarounds would work, but when dealing with hundreds of spreadsheets it's annoying. What also makes things worse is that I used to have another workaround to stop evernote automatically displaying images. I would load a jpeg file as 'picture.dat', then rename it in evernote to 'picture.jpg'. This is a way to stop evernote wanting to inilne the pictures, which I don't want. Being able to change the file extension to fool Evernote into not doing default (and not turn-off-able) behaviours is very useful.
Seemingly someone thought it'd be a good idea to remove file extensions in some recent version and to me this is a major step backwards in valuable functionality. I'm getting closer and closer to just moving to OneDrive now 😞