In bug #100837 support for Office Url schemes was introduced. Additionally, a new protocol specifically for LibreOffice was also introduced, listed below: vnd.libreoffice.command: ms-word: ms-powerpoint: ms-excel: ms-visio: ms-access: Links of this type are properly handled if they are sent to LibreOffice, regardless of platform. On windows, the installer registers this capability with the OS so browsers that get a libreoffice link know it can be opened with LibreOffice. I propose the same capability is registered in the DEB and RPM packages. From what little documentation I have been able to find, it should be enough to add the protocol definition(s) to the .desktop file and/or call xdg-settings. When I get time I will experiment with it and post the results.
thanks Erik.