On a Windows Vista-based computer, you open a remote shared folder in Windows Explorer that uses the Details view and for which the Preview Pane layout is enabled. When you try to open a Microsoft Office Excel 2007 Workbook from the remote shared folder, you may receive the following message:
File in Use file_name is locked for editing by user_name
However, in this case, no other user is using this document.

Note: This problem also occurs when you try to open other shared 2007 Office documents. Different users cannot exclusively edit such shared documents.