ikalo,

It could be a virus with a .bat extension, as MsMittens said. But here's a twist I suspect nobody has thought of:

It would not be hard to write a virus in, let's say C or even VBscript that would infect your computer and then call the command interpreter to run a batch script that contains the line "format c:"

What a great way to hide the virus from semi-knowledgable computer users. Do you feel like this: Just think about this for a minute.

The virus writer knows that the newer versions of windows have system file protection and lock files when they are in use, so he knows that when the format subroutine is called, the windows kernel will kick it out and return an error that the format cannot complete, and this error will be visable to the user.

The quasi-knowledgable user will see this and think....that batch file just tried to format my PC and will proceed to delete the batch file and will probably not think twice about the whole episode. Others will run chkdisk or check the recycle bin to see what was deleted, not even thinking that they may have just infected their computer!

What do you think of that! Anybody want a proof of concept?