I am using vDos version 2017.08.01 and printing well to an Epson printer 80 colons (LPT1 = Raw) from dBase IV programme.
Somtimes, in order to save the continuous paper (fanfold), I would like to print only to PDF by saving the created file - preferably numbered or so on to avoid deleting it by replacing it each time with the same output name on disk.
First, update to version 2019.05.01, you’re two years behind.
If you actually still have an Epson matrix printer, LPT1 = RAW will give the best results. Due the low resolution of these printers you would have to invest some time to set the vDos printer parameters (no Raw) so they give the same (quality) results.
You have to setup a printer w/o RAW, so the DOS program output is interpreted by vDos, and will be accepted by Windows (virtual) printers.
Have a look at FAQs - Printing (https://www.vdos.info/faqs.html) and the Printing.pdf document. Whatever you need should be covered by those.