Add Or Remove File Types To Vista Search Index
Unlike previous versions of Windows, you have more control over what file types you want included or excluded during searches.
To make modifications for file types in the index, press Win+R or click on Start \ Runů to open the Run window and type
Then in the Indexing Options dialog box, click on the Advanced button.
Note: Indexing Options can also be found in the Control Panel.
In the Advanced Options window, click on the File Types tab.
Here, you can add or remove known file types by checking or unchecking the box next to the file type. You can also select how the file should be indexed (circled in screen shot below) by Index Properties Only or Index Properties and File Contents.
To add new file types, type the name of the file extension and click Add new extension button.
After adding the new file type, you can set how the file will be indexed and click OK twice to close the Indexing Options window. During the next indexing cycle, your changes will either be added or removed from the index.