COM FILE:

COM is short for command, being a file that contains instructions that can do something on your computer. COM files are for DOS based systems and tend to run faster than EXE type programs. Viruses will often infect COM files. When the COM file is run the virus is run as well, often loading it into memory. Note: The Windows operating system treats files with a .COM extension the same as other executable type files. Some viruses and trojans use a filename ending in .COM (ie. http://virus.com). Typically, these portable executable files and not real COM files.