File Name
Type or select the filename you want to open. This box lists files with the extension you select in the List Files of Type box.
List Files of Type
If you wish to list only those files whose names end with a certain extension, you can select one of those choices. Otherwise, you can choose to list all files.
Drives
Select the drive upon which the file you want to open is stored.
Directories
Select the directory in which the file you want to open is stored.
Network...
Choose this button to connect to a network location, assigning it a new drive letter.