i was just looking at this recently for the first time. i *think* you have to use Shell command. check back for other replies and search for DOS, Shell, (command) prompt, etc.
MkDir - make a directory
RmDir - remove a directory
FileCopy - copy a file
Name - rename a file
Kill - delete a file
SetAttr - set a file attribute
Dir - "list" your directory (read the help on this to explain what it does)
GetAttr - retrieve file attribut info
CurDir - returns the currrent directory
Environ - returns os level environ variables
FileLen - to return the size of a file ...
.....
I am sure there are more statements or functions that sort of emmulate DOS.