Attachment files can be of any type. When you want to open a file type unknown to your computer's operating system, there will be an Open With dialog opened.
Linking a program to open a specific type of file requires the following steps:
1. | After you have selected a new type of file the Open with... dialog opens. |
2. | Select the appropriate program to open the file with. |
3. | Click the OK button and the file opens with the correct program. |
See also: