http://www.oaltd.co.uk/MVP/MVPPage.asp
FindLink.zip
v8.8 
(21 July 2006, 67k, 84945 downloads) - Updated
To look for links from a workbook, open or install the add-in
FINDLINK.XLA, activate the workbook and use Tools / Find Links. It will
ask you for a text string to look for. You can specify the name of a
specific workbook (e.g. "SOURCE.XLS") or just ".XLS" to find references
to any .XLS file. You can even enter "#REF" to find any names which refer to
deleted ranges or a range name to find where that named range is used.
Optionally the utility will list the occurrences, list and delete (replacing
with values where appropriate), or ask you what to do with each occurrence.
Version 8.8 handles links in URLs, which have / rather than \ in the path.
