If you use an unusual file type that's not currently recognized by the index, you can add it to the index so you can search in Windows by that file type. It can be helpful, if you want, for exampe, to search in a folder with a lot of files (txxt, pdf, doc, etc).
Open Indexing Options by clicking the Start button , and then clicking Control Panel. In the search box, type indexing options, and then click Indexing Options.
Click Advanced. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
In the Advanced Options dialog box, click the File Types tab.
In the Add new extension to list box, type the file name extension (for example, "txt"), and then click Add.
Click Index Properties Only or Index Properties and File Contents, and then click OK.
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