You could also consider using PowerToys Workspaces, which will open a group of apps, each in a specific location on your desktop, or any virtual desktop. It also allows using CLI (command line interface) arguments which provides for opening a specific file in each app. Your entire screen would now be your group, arranged in a configured layout. You can create a desktop shortcut to the Workspace, and even pin it to the taskbar. I haven't tested it, but I would assume you can also pin it to the start menu. You can create as many Workspaces as you need, and give each Workspace a unique name.
I tested this using two CLI arguments for two Word files, and both files opened in a single tabbed Groupy window.
This would provide exactly what you are asking for, except instead of all the apps being confined to a window, you can use your entire desktop. Give it a try and see what you think. 
