You are currently working on UAT 

Not Considering

We cannot support this unfortunately as this is binary format. You would need to resave as XLSX.

Adding .xlsb to file types (under excel)

Dear SDL Team, 

Today I had a document of .xlsb format and tool could not read it. 

Please consider this in the coming updates. 

Thanks a lot

Abdelwahab

Abdelwahab Raslan