Relaunch fails: 'program is currently using this file' (file-lock on relaunch, Windows)

Summary

Clicking Relaunch in the Claude Code app (Windows) fails with an error stating that a program is currently using this file — a file-lock conflict prevents the relaunch/update from completing.

Environment

• Claude Code version: 2.1.205
• Client OS: Windows 10/11
• A background helper process associated with the app appears to hold a lock on a file the relaunch needs to replace/open.

Steps to reproduce

1. Have the Claude Code app running on Windows.
2. Trigger Relaunch (e.g. after an update, or via the relaunch action).

Actual behavior

• The relaunch fails with a message that the program is currently using this file (a sharing/lock violation). The relaunch cannot proceed while the file is locked.

Expected behavior

• Relaunch should release/close any file handles the app or its background helper holds so the relaunch can complete cleanly, or retry until the lock clears.

Notes

• Appears related to a background helper process that keeps a file handle open (or respawns), re-locking the file at the moment relaunch tries to use it.