Hello guys,
After installing DO all folders open with DO except the trash...
What's wrong?
Thanks,
Trash is left for Explorer to handle, since you can't do anything that folder other than restore a file or permanently delete a file.
Ok got it! Thank you!
Recycle Bin
I wrote 'Recycle Bin' to help anyone who might search for this information.
Great thank you, sorry for my basic english!! 
At the end, I find it a limitation in terms of ergonomic, because as sometimes you need to open the recycle bin to check its contents, you are then locked in the Windows Explorer interface and you can't continue working or join the OD interface without closing that window and opening a new one.
But the good news is that there is a setting to change that:
Preferences / Directory Opus Launch / Explorer replacement / Replace explorer for all except the following folders and delete Recycle Bin.
You can also open Opus and navigate to the recycle bin if you want to view it inside an Opus window/tab.
Yes, for sure, but it also happens that you open it from the desktop and that was a bit annoying for me. But hopefully, you have done a specific setting. Great!