They can infect any Intel-compatable PC which is configured to boot from a floppy drive. More secure operating systems such as Windows NT can be infected but may prevent the virus from replicating. A PC which boots from an infected floppy disk becomes infected. There is no standard naming convention for this type of virus. Infect other executable files.
Some viruses become memory resident and infect other programs when they are run.
Others actively seek out other files to infect. There is no standard naming convention for this type of virus. A file created specifically to introduce a virus, worm or Trojan into a system. The file may be of a different type to the virus, worm or Trojan it introduces. There is no standard naming convention for this type of virus.