Re: Command prompt says 'edit' is an invalid command
That guy really shouldn't be making those tutorials because it's obvious that he doesn't know that much about using the command prompt.
For instance, when he is in the C:\users\dima folder and wants to go to the folder he created called x, he first enters cd\ to return to the root folder (he refers to it as the C: drive but it's actually the root folder of the C: drive) then enters cd x to go to the x folder. He doesn't even know enough that he can go directly to the x folder from the C:\users\dima folder by simply entering cd \x. It's not necessary to first go to the root folder but that's the way he shows how to do it.
He is running Win 7 but only the 32-bit version of Win 7 includes the DOS editor, the 64-bit version doesn't. You can follow his tutorial if you substitute notepad for edit in his example.