1. Use the simulator to be the source and DNC from the RS232 port.
2. Add more memory to create a larger ram-drive and RS232 to it and then DNC from it.
3. Put in a hard drive and RS232 to it, and then DNC from it.
4. Put in a hard drive and a network interface card and copy the file to the HDD and then DNC from it.
In the olden days, you could get LS120 floppy drives that would hold 120mb disks or ZIP drives that held 100mb disks but I haven't seen them for some time.
You might look into a memory card reader (CF's and SD's, etc) I have installed them in some cases.
If you need to run these large files frequently, put in the networking, you won't regret it.