Go MS-DOS and type in help, should show you all the commands.
This works in XP.
I remember there are 2 commands, copy and xcopy. copy command will
copy a file to another location.
xcopy command copies files and directory trees.
How to use copy command:
Change the directory of the command prompt to point to the location
where the file is located. For example, your file is located in
desktop, just type in cd desktop.
Then type in this:
copy filename destination
Example:
cd desktop (my file is on desktop, so I change the directory,
otherwise, Windows will say file not found)
copy gromozon.pdf d: (This means I copied gromozon.pdf to D
drive.)
For full details on copy command, just type in copy
/?
The above works for XP.
Other versions of Windows will work similarly, if it doesn't, you
have to type in a lot of things manually.