There are tools you can install, but try this first:

Select an empty section of a worksheet
Insert>Names>Paste>Paste List
Then check the references  for each name to see if it points to another
workbook.

If you want to change a reference or delete a name:
Insert>Names>Define
Select the name
then either delete it or change the reference.

If you don't see any linked workbooks...Repeat the paste list on each sheet
to discover if there are any sheet-level names that are a problem.

If that doesn't work...post back.

Does that help?

***********
Regards,
Ron

When I can't find links, I'll use Bill Manville's FindLink program:
http://www.oaltd.co.uk/MVP/Default.htm

You can try the Excel menu path Edit / Go To and then choose the Special
option at the bottom left of the dialogue box.  Then choose the Formulas
option and click okay.  All the cells that contain formula's will be selected
(on active worksheet).  You can use your tab key to go through each cell and
view the formula bar for a link to another document.  It's not the best way
but the only way I know how.  Hopefully your file doesn't have too many
worksheets and/or formulas to go through.

Hope this helps.

Thanks,
Bill Horton