Failed to resume chat on old codex desktop chats, MXC launcher says SYSTEMROOT is missing

Feb 12, 2025
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codex desktop on windows, old local chats wont open after the update

Failed to resume chat

error resuming thread: failed to load AGENTS.md instructions for environment `local`: fs sandbox helper failed with status exit code 1: MXC launcher: The supplied `process.env` cannot launch a Windows process container because it is missing the required variable(s): SYSTEMROOT.

only rollback to the 26.1016.8120 package helps. fix isnt shipped yet
 
OpenAI closed the GitHub issue as completed. One person on desktop 26.1023.6621.0 says the SYSTEMROOT error stopped showing up, but that's a single report so far, not a release note.