Hello, and welcome to the Opus forums... As the things you've mentioned below are all unrelated to one another - just be aware that you'll generally be asked to post one topic per thread.
Confirmed... and that the same operation (with same source and dest for the drag and drop) works fine in Windows Exploder... reported as a bug, and referenced this post.
That's not default behavior from what I'm seeing with stock settings. If you goto Settings->Customize Toolbars and look at the Keys page... what do you see for F3 bindings? Is there more than one? If not, does the one there say Type -> Toolbar? When you hit F3, does the find panel popup or is focus placed in the 'Search' field at the top right corner of the Location bar? If the Search field... if you again enter Customize mode and 'edit' the search field, are there any Args listed for the field (though I couldn't find any documentation on supported Args for the Search field-type).
Confirmed... reported as a bug, the confirmation only seems to be thrown for the first Delete command. As a potential workaround, you could just run a single delete command for both extensions: Delete *.(aaa|bbb)... but you might have a good reason to keep them separate, if you actually WANT separate confirmation/warnings to let you know if there are in fact files of each extension to delete and you want to say yes to some but no to others...
Confirmed - I configured the 'Unknown file types' category in the File Types Editor to run notepad {f} on Left double-click... and see the same when dbl-clicking on a shortcut to a unc remote computer path (from under the 'Network' namespace node - with Explorer since creating such a shortcut fails in Opus per your report above). That said:
- Is the option in Preferences->File Operations->Double-click on Files->Open unregistered file types in text viewer... not sufficient to achieve the actual goal?
- You said ~some .lnk files are treated this way. Are there ~other .lnk files which are treated differently when you config Opus this way - or am I just reading that statement wrong?