I did this in this way:
- add a 2nd CD-drive to the netware VM
- burn the license key (and nw5-idle.nlm - you need it, too) into a iso image.
- create the dos partition with the netware CD and assign it to the 2nd CD-ROM drive
- download freedos and boot
- copy the files to C:\
Now you can reboot from the netware CD and you have access to the files.