According to MS:-

"The following file formats are no longer supported in Office Excel 2007.
You cannot open or save files in these file formats."

..wk4

Please hit Yes if my comments have helped.

Thanks!

"tms0926" wrote:

Good morning,
I save Excel 03 spreadsheets as WK4 to import data into a lotus notes
database. Can Excel 07 spreadsheets be saved as WK4? Is there a file
converter available?