From Developer 7.x and above, go to System Search under Cutomized Functionality.
-In the work area, right mouse click and select add.
-From the drop down box, select "Select File Path, By searching in a specific folder"
-insert the file name that you want to search for
-In the look in option, click browse for the folder you want to start your search in, you can then select the number of subfolder levels you want to search.
-If you are creating two or more searches, take note that the first file search you create is the last file that gets searched.