you could do it through a batch file (DOS).
if you use the TYPE command and >> it will append one file to the end of another.
Type C:\file1.txt >> C:\file2.txt
This will put the contents of file1 onto the end of file2. If you need a carrige return between the appended documents, you can create another txt file that has only a return in it.
If this will do the trick, then open notepad, type in the command, and save it as a .bat file and you can call it from within access.