File Open dialog box
The following options allow you to specify which file to open:
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
Select the type of file you want to open.
Drives
Select the drive containing the file that you want to open.
Directories
Select the directory containing the file that you want to open.
Network...
Choose this button to connect to a network location, assigning it a new drive letter.