I received a .xlsb file from a friend of mine to do some work on and have not been able to open it in LO.
I tried to open it last night, Calc was acting like it was opening the file; then it just crashed.
This is an Excel Binary Workbook File and i don’t think that LO Calc can open it. It is suggested it is used for large Workbooks as it is more compressed. Get your friend to send it in .xlsx format.