Excel 2000

I'm trying to write a macro that will automatically update WorkbookB from
WorkbookA. I have it worked out - almost. The problem is that WorkbookB
has to have the Read-only checked in it's document property making saving
the document a little tricky.

In the macro I have
Workbooks.Open Filename:="WorkbookB.xls", Readonly=False
Thinking that it will open WorkbookB in ReadWrite Mode but it still open as
ReadnOnly.

Is there a way to change a workbook from read only, make document changes
then save document back with read-only, without changing document name?

Thank you

PJ