Node red multiple instances

Core Development
11

Hi, could you please explain how to set NSSM to run two separate instances at boot in windows 10?
I've tryed several ways without success. Till last week I just run node-red at boot with NSSM without problem, now I need to run a different node-red instance on the port 1881. By the command line it's not a problem (node-red -p 1881 -u c:/....", infact I created a dedicate folder that has been populated with it's own files as suggested on the previous posts. I even modify the settings.js file inside this folder changin the "uiPort: process.env.PORT || 1881"
But I'm not able to make this service running.
I configure it as following:
Path: C:\Users\1\AppData\Roaming\npm\node-red.cmd
Startap directory: C:\Users\1.node-red-two
Arguments --settings "C:\Users\1.node-red-two\settings.js" > "c:\temp\node-red\node-red-two.log"
for what I've understood the problems is the node-red.cmd file called inside the path.
Could someone please help me? Should I create a new path? Which files should I copy in and how modify them?
Many thanks