I have WinRAR on my PC but wish to open RAR files in the current lister when I'm navigating in a DOpus 9.0.0.8 window. I've read the FAQ and set the double-click event to Go (the Open action is not defined) but this doesn't work as I have my files/folders set to open on a single click. What do I need to do?
Never mind. Closing all instances of DOpus and then reopening seems to have done the trick.
Is there any particular reason you are using Opus 9.0.0.8? It's over six months old.
If it ain't broke, don't fix it? 
Seriously, I do look over the release notes for each version and see if anything pertains to me. I'll probably upgrade this week as I have a couple of RAR files that won't open in DOpus.