There is very little on the emulations part of OS4. Every thing I have read says, it is just suppose to work if the app is written for the OS and doesn't make chip calls. So I have been playing around trying to get old apps to work cause I paid a lot of money for them back in the day. I just copied my Finalwriter directory off my 4000. When I clicked on Finalwriter icon to launch it, nothing would happen. So I got looking around and in fwfiles there is the fw.prefs file. I renamed that to fw.prefs.old. I clicked on FW icon and it worked. It seems to be the screen resolution that won't let the old apps run that are written for the OS.
With this in mind, I have been successful with getting the following running with just copying the dir over to OS4 without going through installing them from floppy or floppy image.
Finalwriter
FinalCalc
DynaCad
ProCalc
I have been trying to get Pagestream 5.0 to work but I keep getting the grim reaper.