how can i open or publish msd in 10.5 versio
we have old published services using 10.0 version.
now trying to publish it to 10.5 version of server.
Check the below link for 10.5.x:
PublishMSDToServer—Help | ArcGIS Desktop
Please refer Publish a service definition to the server in Manager—Documentation | ArcGIS Enterprise
I hope this helps!