Follow this advice and create a PersistentHandler for that filetype. Use
{5e941d80-bf96-11cd-b579-08002b30bfeb}, if it is a plain-text file.
Windows® XP - Search Problems - Containing Text:
http://www.dougknox.com/xp/tips/xp_bad_search.htm
Additional Note from Torgeir Bakken:
<quote>
WinXP's search function filters out files to search in based on file
extensions (see further below).
Install the free Agent Ransack, it searches for text strings in *all*
types of files, and not just in a selection of "approved" file extensions
as the built-in search does. It's a *much* better search tool as well...
http://www.agentransack.com/default.aspx
Agent Ransack can save the search result to a file (or clipboard), as text,
comma separated text or tab separated text. E.g. Excel reads comma separated
text (csv) very well.
</quote>
--
Ramesh, Microsoft MVP
Windows XP Shell/User
Windows XP Troubleshooting
http://www.winhelponline.com