Maybe...

http://www.contextures.com/xlfaqApp.html#ReadOnly
(from Debra Dalgleish's site)

Paul wrote:

When i oppened my last saved excel file, it showed "cannot be accesed. the
filr may be read only oryou may be trying to accessed a read-only
location....."
As i did remember i 've saved my document propperly and closed the file.
How can i recover or fix my document.

--

Dave Peterson