In the LO 5.3 release notes under:
Office URI Schemes support
-
Does the
ms-access:
URI make it so that Base is pointed to when a ms-access: URI is used in Windows? -
What does “vnd” stand for in this description, and what is this for, and how is it used?
Also, a new custom Libreoffice-specific scheme is introduced:
vnd.libreoffice.command: