What's changed in version 4.0.1 (14 May 2020):

• Fixed a bug that made WhatsOpen crash on OS X 10.10 and 10.11.
• Updated the toolbar icons with the ones from WhatsOpen 2.7.

What's changed in version 4.0 (3 May 2020):

This version is based on version 2.1 of the original app as released in 2008.

• Added a Volumes column.
• Removed the CPU column.
• The Volumes, Users and Apps popup menus show the number of open files per menu item.
• The Superuser login can be saved in the Keychain - see Help / Root for explanation.