The Open file command can be accessed from File context menu > GRAITEC PowerPack > Open file(s).

Open files - Command
The command Open file(s)… is available for the currently selected file(s), multi selection is possible.

The command is also available inside the tabs Uses and Where Used of the Vault Explorer Preview Pane. Calling the command asks the user whether to check out the file(s) or not and opens the file(s) with the associated application.
Configure programs for Open file(s)… command
Command: Tools menu > GRAITEC PowerPack > PowerPack options

Open files – PowerPack options