- Mimefilt.dll: Filters Multipurpose Internet Mail Extension (MIME) files
- Nlhtml.dll: Filters HTML 3.0 or earlier files
- Offfilt.dll: Filters Microsoft Office files (Microsoft Word, Microsoft Excel, and Microsoft PowerPoint)
- Query.dll: Filters plain text files (default filter) and binary files (null filter)
In Microsoft Windows 2000 and earlier versions of Windows, all files are searched for the content that you specify. Windows XP does not search all file to enhance the performance of searching and to avoid extraneous results. This behavior occurs whether or not you use the Indexing service when you search.
Method 1To resolve this problem for the following types, obtain the latest service pack for Windows XP or install the "Windows XP Application Compatibility Update, October 25, 2001" from the Windows Update Web site.
For example, to use the text filter provider for .zzz files, the following registry setting should exist:
- The plain text filter may not work for all file types. If adding the plain text filter for the file type does not work, contact the vendor of the file type for availability of a filter for that file type.
- The HTML 3.0 filter (Nlhtml.dll) ignores text that is contained in comments in an HTML file (for example, a file with an .htm or .asp extension). To search for text that is contained in comments in HTML files, use the plain text filter or the method that is described in method 2.
Method 2To configure Windows XP to search all files no matter what the file type, obtain the latest service pack for Windows XP and then turn on the Index file types with unknown extensions option.
If you use this method, Windows XP searches all file types for the text that you specify. This can affect the performance of the search functionality. To do this:
- Click Start, and then click Search (or point to Search, and then click For Files or Folders).
- Click Change preferences, and then click With Indexing Service (for faster local searches).
- Click Change Indexing Service Settings (Advanced). Note that you do not have to turn on the Index service.
- On the toolbar, click Show/Hide Console Tree.
- In the left pane, right-click Indexing Service on Local Machine, and then click Properties.
- On the Generation tab, click to select the Index files with unknown extensions check box, and then click OK.
- Close the Indexing Service console.
Network administrators can configure this setting by modifying the registry. To do this, set the FilterFilesWithUnknownExtensions DWORD value to 1 in the following registry key: