I haven't a clue as to where you guys find the time to write about the crap
you do. You must be on someone else's payroll and have no life.
Anyway, the fix seems simple enough, but is absolutely an unnecessary
nuisance in my opinion.
Per the link I posted:
To resolve this problem for other file types, install a program that
registers a filter for the file type that you want to search. If no program
that provides a filter is available, you can use the plain text filter for a
file type. To do this, add a PersistentHandler key under the file type key
in HKEY_CLASSES_ROOT and set its (Default) string value name to the
following value:
{5e941d80-bf96-11cd-b579-08002b30bfeb}
WARNING: If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using Registry
Editor incorrectly. Use Registry Editor at your own risk.
For example, to use the text filter provider for .zzz files, the following
registry setting should exist:
HKEY_CLASSES_ROOT\.zzz\PersistentHandler\(Default) =
{5e941d80-bf96-11cd-b579-08002b30bfeb}
After you add this value to the registry, you must log off and then log back
on to make the change take effect.