PortableApps could have an option to start a program. Something like "autoexec.bat".
New: BriskPlayer (Jun 08, 2026), Platform 30.4.1 (May 30, 2026)
1,400+ portable packages, 1.2 billion downloads
We're operating at a loss but still ad free. Please donate if you can!
This post is about exactly what you are requesting. It is in current development. Why don't you take a look and see if you have something to add to the process?
https://portableapps.com/node/13855