There is a potential threat that you may want to be aware of. You are under some threat of virus infection if your web browser or mail reader will automatically execute MS Word, MS Excel, MS Access or MS Power Point. If you have these MS Office products installed and your software is configured to launch these products, we strongly suggest you use the option setting menu to turn this off or substitute one of the free viewer programs that Microsoft provides. There is another potential threat that you may want to be aware of. When you hit the key that was reassigned, the command will execute just as if you had typed it yourself.
Viruses can also infect any file which is in some way executed.
It's even possible to write viruses for batch files, word processors, or spreadsheet macros. The virus may place this file in the same directory or in another directory on your DOS path. Here's what happens. The user probably doesn't notice anything wrong. This type of virus is fortunately easy to detect by the presence of the extra files.