Got a file that you’d rather not appear when searching? Things like password dictionaries (hey, I’m a white hat security guy) come up a lot because, well, they’ve got a godzillion words in them.
To disable indexing for a file, just follow these steps:
1. Right-click it, and then click Properties.
2. On the General tab, click the Advanced button.
3. Clear the Index this file for faster searching check box.

4. Click OK twice.
Now, Search won’t index it, and it won’t appear in your search results.