I am afraid currently .PS (PostScript) file format is not supported by Aspose.Pdf for .NET. However for the sake of correction, we already have logged this requirement as PDFNET-20110 in our issue tracking system. Once the support is implemented, you can use this API to Convert PDF to DOC or DOCX format or Extract text from all pages and save the output as .TXT file.
Please be patient and spare us little time. We are sorry for this inconvenience.