I'm guessing that the OP is using xl2007 and wants to know about .xlsb (or
..xls)?

http://www.microsoft.com/interop/doc...ryformats.mspx
or
http://office.microsoft.com/en-us/he...069351033.aspx

From what I've read, the .xlsb binary files open a little faster (less for excel
to do???).

And yep, they can contain macros.

I still use personal.xla in xl2007. I haven't resaved it as .xlab (yet).




Pete_UK wrote:

What do you mean by "binary format"?

Pete

On Apr 25, 8:16 pm, John wrote:
Is there any benifit to using binary format for your workbooks? does it
support macros? work fine with addins?

--

Dave Peterson