[quote="benpal"]Same problem since Dopus 11, all other things equal.
Dopus closes silently on right-click on any file type, but not on folders.[/quote]
Same problem -> Same answer -> Use this guide, from the FAQs and linked in 3rd post in this thread, to find the shell extension causing the crash:
[ul][li]Crash, exit or high CPU when right-clicking certain files[/li][/ul]
(Assuming you are not using Notepad++; if you're using that, try updating it first, since that fixed the problem a couple of people were seeing and may save you time.)