PS7-packaged: pwsh not discoverable in SYSTEM / LocalSystem context

Summary

When PowerShell 7 is installed as an MSIX package, pwsh is not available in non-interactive system contexts. MSIX packages register per-user only — the SYSTEM account and other service identities cannot locate or invoke pwsh.

Affected scenarios

• Scheduled tasks running as SYSTEM
• Windows Services running as LocalSystem or a service account
• MDM-deployed scripts (Intune, ConfigMgr)
• Deployment agents and automation pipelines running in non-interactive contexts

Repro

From an elevated prompt:

psexec -s -i pwsh.exe

Expected: PowerShell 7 launches.
Actual: The system cannot find the file specified.

Context

This is a known architectural constraint of MSIX packaging. We are working with the relevant Windows engineering teams on a resolution. We have internal tracking for this work and will update this issue as progress is made.

This is a blocker for the PS7 inboxing initiative.

Start with the elevated psexec -s -i pwsh.exe reproduction and the issue's description of MSIX per-user registration. Investigate how PowerShell 7 is packaged and discovered in SYSTEM, LocalSystem, service-account, and other non-interactive contexts. Done means pwsh launches successfully in those affected scenarios.