2. If that is not an option, open the file with a text editor. If the first line of the file looks something like:
%%Creator: Oracle Toolkit 2 for Motif 220.127.116.11.0 PRODUCTION
%%Version: 6.0 8
then the file is in Postscript format. To convert the file to PDF format, use a utility, such as on https://online2pdf.com/convert-ps-to-pdf.