Each file name extension has its own set of verbs, which can be obtained by using the Verbs property. For example, the "print" verb will print a document specified by using FileName. The default verb can be specified by using an empty string (""). Examples of verbs are "Edit", "Open", "OpenAsReadOnly", "Print", and "Printto". You should use only verbs that appear in the set of verbs returned by the xtd::diagnostics::process_start_info::verbs property.