This functions opens a dialog box allowing selection of WIT documents : files with "*.wit" suffix.

The chosen document is loaded and displayed in the main view.

WIT is multi-document : you can switch from one opened document to another with the Ctrl + Tab keys combination, or by using "Windows" menu to arrange views.

Note : WIT sets a "lock file" when editing a document to prevent concurrent access (by other users on a network for instance). This lock is removed when you close the document. If you open an already locked file, save will be disabled.