My Documents opens in regular Explorer

running do on an older laptop with xp pro sp2

for some reason, clicking on 'My Documents' on the desktop switched to being displayed in the regular explorer.exe instead of dopus

however, if I click start, run and type just My Documents, it opens in dopus

obviously explorer replacement with dopus is set in preferences, what else may need to be tweaked?

Try disabling Explorer Replacement in Opus, closing the Preferences window (with 'OK'), then opening Preferences again and re-enabling Explorer Replacement.

If that fixes it then it was probably something resetting a registry value which is used when My Documents is launched but not when most other things are.