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.
Go to Start/Run/Regedit and 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}
For example, to use the text filter provider for .pas 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.
Using the "A Word or Phrase in the File" Search Criterion May Not Work
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q309173
More info here:
Troubleshooting Search - Text
http://www.kellys-korner-xp.com/xp_s.htm#searchtext
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Happy New Year,
Kelly (MS-MVP)
Troubleshooting Windows XP
http://www.kellys-korner-xp.com