The level of detail for the step details part of the run results.
PublicProperty StepDetailsReportFormat AsString
Short. Exports a summary line (when available) for each item in the run results tree. The short report does not include still images associated with the steps in your run results.
Detailed. Exports all available information for each item in the run results tree. The detailed report includes still images associated with the steps in your run results. (In the Run Results Viewer, these images are displayed in the Captured Data pane.) If a bitmap checkpoint step displays expected, actual, and difference bitmaps, these are also included in the printed report.
UserDefined. Formats exported data using a customized .xsl file that specifies the information to be included in the exported report, and the way it should appear.