How to open and read particular files on iOS (.xpt .por)?
.xpt files are SAS XPORT files; .por files are ascii data files created by SPSS.

StatsGuru for SPSS is a iOS app:


  Stats Guru is a tool to help social scientists determine the correct
  statistical test for their data. The tool then provides a walk-through
  for each test, using SPSS Version 21.


SAS Mobile BI is an iOS app.


  SAS® Mobile BI empowers decision makers with business reports and
  dashboards anywhere, anytime! SAS Mobile BI, part of the SAS® Visual
  Analytics solution, enables you to access and interact with reports
  and report elements such as graphs, tables, KPIs, and data grids.