Once you have Windows Search for Windows Vista or Windows XP, you might be wondering how you can be even more efficient when it comes to finding files and e-mail on your PC. Advanced Query Syntax (AQS) can help you do just that. Using AQS, you can quickly define and narrow your searches for even more targeted results.
You can narrow your searches using a variety of keywords, or search parameters, which can restrict your query to specific locations, specific file types or properties within those types, or specific "file kinds." File kinds are displayed at the top of the Windows Search Explorer.
That said, Windows Search also supports some far more advanced usage.
Source:→ SuperSite Blog