Since it is just a raw printer commands file, you can do the following (I have done it in the past with Zebra and TSC label printers):
1. Share the printer. On Windows, its Printer properties, sharing and create a share.
2. Test by running the following command: copy <filename> \\<hostname>\<sharename> . You can use localhost, if it is on the local PC.
3. In Labview, use the .NET Copy command, as LV copy doesn't support local shares for some reason.