File is locked for editing by 'another user'

In my case, end user was unable to edit excel file located on network share :

In searching for 'another user', I confirmed that no other user was having this document opened and antivirus real time scanners were disabled on both local and server machines. There is Microsoft KB http://support.microsoft.com/kb/814112 suggesting to avoid setting full control on share and ntfs permission. Unfortunately, the suggested KB didn't change the behavior that the file is locked for editing.
In quest for 'another user' I've ended up that sharing violation was causing Windows Explorer trying to collect file info like size,author,date etc ... So, after turning off :

• Details Pane (Organize -> Layout -> Details Pane)
• "Show pop-up description for folder and desktop items" (Tools -> Folder Options -> View tab)
• Preview Pane (Organize -> Layout -> Preview Pane)

the end user was able to open the document for editing.