Hi Aziz,
This has been updated in SharePoint Online, where the durable links are added to provide a resource Id.
The parameters at the end of the file URL in SharePoint library is the GUID of the document which is used to identify the file. The resource Id assigned to individual documents is stored in the content database related to the source document. When using Durable Links (d), when a user selects a link to a specific document, SharePoint Server looks up the file by the resource Id and opens it in Office Online Server Preview.
Thanks,
Neha