Povl H. Pedersen <ECO861771@ecostat.aau.dk> writes: "You can make your copy of Nisus read MacWrite II files (I can even read DOS WordPerfect 5.0 files and a lot more). If you keep the option key pressed while selecting Open... Nisus will use the Claris XTND technology if it is installed. And the good news is that there is a XTND Developer package available at ftp.apple.com that includes XTND and filters for MacWrite and MacWrite II. It's in the /dts/mac/tools/xtnd directory, but it's big, about 520K. The XTND file must be in a folder named 'Claris' inside the System Folder, and all translators goes into the 'Claris Translators' folder inside the 'Claris' folder." [This trick works in 3.06; I can't comment on previous versions. I think more translators are available from third parties like DataViz.]
Compare More Easily in Apple Mail
In Apple Mail, if you need to work back and forth between two different views of Mail's mailbox contents, you can do so quite easily. For example, you might want to look at a mailbox holding all filtered-in sales orders from the past week while also looking at a smart mailbox showing unanswered customer questions.
To avoid constantly clicking between mailbox views and losing your context each time, choose File > New Viewer window to get a second window and then arrange each window as desired.