Excel 2003 SP3 on XP Pro SP3

I have a workbook I have created to use as an index to infrequently used
workbooks using hyperlinks to create a point and click Document Index.
It works well for why I created it; now I'd like the ability to encode
some of the links to open read-only instead of read-write. I didn't find
anything in the help files ... is this possible?

Thanks in advance!

Clif