Excel - XLSX vs XLSB - what format is preferably and when?

Asked By Andrey So on 25-Feb-09 02:29 PM
New Excel 2007 / Excel:2008 supports new formats - XLSX and XLSB. As noticed
in documentation, XLSB is variation of XLSX but binary format used to store
the date therefore XLSB files are smaller in size and faster to load/save. No
any other differences ware founed by me between this two formats.
My question is - when it's preferably to use XLSX and it's prefer to use
XLSB? It's seems to me XLSB is better by all and it's not needed to use XLSX,
but XLSX was choosed as default Excel 2007 format and this fact must have a
reason. What are the main cases to use XLSX and what are for XLSB?
Than you.

JLatha replied on 25-Feb-09 05:47 PM
See this page for a more complete discussion:

Primarily you'll note that the difference is whether or not a file CAN
contain macros or not.  An .xlsx file cannot (but .xlsm can) while .xlsb can
contain macros, but of course doesn't have to.  Bottom line is that as long
as all users have Excel 2007, the .xlsb format is probably the most efficient
way to go.
AndreySo replied on 25-Feb-09 10:27 PM
Thank you very much.
The only plus of XLSX format is that my iPhone "Files lite" application can
display XLSX files and can not display XLSB.
From you reply it's clear than XLSB format is more functional and more
preferred to use if there are no any conditions to prohibit it.
Ron de Bruin replied on 26-Feb-09 05:43 AM
Hi Andrey

Code that use ADO have problems with xlsb files so I use xlsm by default
because i use a lot of code in my workbooks.


Regards Ron de Bruin
AndreySo replied on 26-Feb-09 06:18 AM
One more fact that XLSB is more suitable as standalone data file for
Excel-use only, but XLSX is better for use in programming and Excel-data
processing usinn any external programming interfaces.