Not all BuiltInDocument properties are maintained by Excel. For
file size, try

Function FileSize()
FileSize = FileLen(ThisWorkbook.FullName)
End Function


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com


"dflayfield" wrote in
message
...
I need to populate a cell with the current file size of the
active workbook.
I have tried:

Function FileSize(I As Integer)
FileSize = ThisWorkbook.BuiltinDocumentProperties(I)
End Function

and called the function in the sheet with:
=FileSize(22) ' 22 being the code for "Number of Bytes"
I get a #VALUE! error.

But if I use:
=FileSize(3) '3 being the code for "Author"
it works properly.

Any ideas?

Thanks,
Dave