I just tried it and it does work:
net use lpt4: \\cr_ws06\hp4050
is the command I used. If you want the capture to be permanent, put /persistent:yes at the end.
I've used this with NT4 as well. If you are starting a DOS based program, use a batch file with net use lptn at the beginning and netuse lptn /delete at the end then call your program between the net use statements.
I did note that when I did a
copy file lpt4:
it did not work saying that lpt4: was an unknown device, but it did work when I said:
copy file lpt4 (no colon)
Hope this helps!