inetloc files broken in Mojave 10.14.2
So, the only solution now is to create an AppleScript app (using Script Editor) with the following command:

tell application "Finder" to mount volume "smb://login:password@address/Sharepoint"


note that this works with nfs shares too -- even though inetloc files never did...

Alternatively, you can use the command: 

tell application "Finder" to open location


but that no longer works with nfs shares since 10.14.2 either