Double Click any .xosm projectfile and it will start PI and the Project. (if you have in windows
xosm files declared to be started with PI).
Or add in the C:Program Files/Pixinsight/etc/Startup/Startup.scp script,
with Script Editor, the last line to:
.open C:\directory\directory\projectname.xosm
This starts, when starting PI also the Project mentioned in the .open line.
Gerald