Based on documentation I am guessing not, but I wanted to ask. I tried simply changing the file extension, but that just caused it not to save at all.
Yes, I’m afraid that XLSB is not supported.
We have a feature request for this and please feel free to vote for it to increase its priority:
But at this moment I cannot say when this will be available. We’re currently working on some other feature requests that have greater priority (more user requests), so this feature’s implementation definitely won’t be available in the first quarter of this year.
I am not sure how to up vote it, but I did post a comment
showing support for it.
Click the thumbs up () button on the left with the counter above it.