The CopyFile function copies an existing file to a new file.     BOOL CopyFile(        LPCTSTR lpExistingFileName,        // pointer to name of an existing file 
    LPCTSTR lpNewFileName,        // pointer to filename to copy to 
    BOOL bFailIfExists         // flag for operation if file exists 
   );        
     Parameters    lpExistingFileName    Points to a null-terminated string that specifies the name of an existing file.     lpNewFileName    Points to a null-terminated string that specifies the name of the new file.     bFailIfExists    Specifies how this operation is to proceed if a file of the same name as that 
specified by lpNewFileName already exists. If this parameter is TRUE and the 
new file already exists, the function fails. If this parameter is FALSE and 
the new file already exists, the function overwrites the existing file and succeeds.          Return Values    If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.     Remarks    Security attributes for the existing file are not copied to the new file.