Open Windows Explorer
Goto Tools --> Folder Options in the menu
In the Folder Options select the View TAB
In the list of Advanced Settings de-select "Hide file extensions for known file types"
Select "OK"
Now whenever you see a file attachment in any Microsoft writen Windows Program the File Nome will display with the extension. The is usefull when a virus is sent to you that has a double extension such as Fubar.txt.exe which under the default settings will display as an inocent text file when in really is a program.
thanks Woodman