@Nick
Yup, I see what you mean. However, I've managed to sort it out.
Here's a walk thru:
1. Copy the icon as previously discussed.
2. In prefs/preview options, ensure that the OpenScreen tickbox is, err, unticked.
3. Save as Default_New (or whatever). This is where it will probably crash. So reboot if it does. If it don't, close IFX anyway.
4. Open the icon information and change the PREFS= to your new prefs file and add the WORKBENCH tooltype as previously discussed. Save.
IFX now boots up on your Workbench.
-john