(VS.Net 2005/Visual Basic)
I've got a MDI application which, after about 3 months of development, I
changed the name.

I looked through every file, every config file, every xml file, every
directory, to remove any reference to the old application name.
All the assembly information references the new app name. There is no
reference to the old name in code, configs or assembly information.

However, after several files are open, when changing focus to one of the
previous files, the tab for the application changes to the older name, with
the actual filename in parentheses. In code, I add the path of the file as
the 'DocName', so it will appear in the tab.

Any ideas on where to look for what might be causing this?