Themal Trend will save your reports in a HTML format or as a PDF document. As a HTML file you can open the report up in Microsoft Office applications like Word or Execl and edit the file directely or you can use any web borwzer to view the file. As a PDF file you can use Adobe Reader view it or Accrobat to edit the PDF file. There are other PDF editors that will work as well.
Since Thermal Trend used a XML/HTML report engine, you can create your own report templates to work with our report engine XReports to create your own reports or edit the existing ones that come with Thermal Trend. All you need is Note Pad to edit the report templates.