RDP connections are distributed as .rdp files which can be (but aren't often/ever) signed. If the file isn't signed you get this warning. If you spin up a windo

RDP connections are distributed as .rdp files which can be (but aren't often/ever) signed. If the file isn't signed you get this warning. If you spin up a windows ec2 instance and downlaod the RDP file from AWS, the file isn't signed so you get this warning, for example.