“Save”, and “Save as…” work in the usual way. If you opened an existing dictionary, it will be saved with the same resource ID and name in the same file. If you choose “Save as…”, or have created one from scratch, you can specify the resource ID of the dictionary in the save dialog box. You can specify you preferred resource ID, resource name, and file type in the Preferences dialog.
At present, you cannot save any changes in text files; they are used simply to test the dictionaries.