The standard report output is PDF. You can look at the report for the project at anytime by clicking on Report and selecting Preview. Viewline works by enabling you to add data from your CCTV survey to the Viewline database (project.sdf). When you select Report and create a report, that data is used to create the (PDF) report. PDFs are created using whichever PDF app is on your PC. Often via the Microsoft Edge browser as this has a native PDF viewer. If you had another default PDF viewer, Viewline would use that to display PDFs.