Use default browser:

Open HTML reports using the default associated program.

Open reports in new browser window:

This option is mostly useful if the default browser is Internet Explorer because it reuses open browser windows when opening pages from disk by default.

Use custom browser:

Open HTML reports using the specified program.

Show reports in the Internet zone when using Internet Explorer:

Use this option to force Internet Explorer to show reports in the Internet security zone even if they are located on a local drive. This option is useful if you use Internet Explorer with the "Allow active content to run in files on My Computer" option disabled (this option was added in Windows XP SP2). In such case Internet Explorer doesn't run scripts in local pages so the report contents tree isn't shown. Showing pages in the Internet zone can help to avoid this problem because Internet Explorer allows pages in the Internet zone to use scripts in most cases. WebLog Expert forces Internet Explorer to show pages in the Internet zone by adding a Mark of the Web comment to generated pages.