[BUG] ARM64 Windows working with Claude cowork

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

message from cluade: Still no luck. At this point we've tried everything that can be done from our end — WSL2 is configured, the bundle was recreated fresh, but the VM guest keeps timing out trying to connect.
This is likely a known issue or something specific to your setup that needs Anthropic to look at directly. I'd recommend raising it with their support at support.anthropic.com and mention you're on ARM64 Windows — that detail is relevant since the app is using smol-bin.arm64.vhdx and there may be specific issues with that configuration.

What Should Happen?

cowork should work

Error Messages/Logs

2026-03-05 10:11:58 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-05 10:12:00 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-05 11:57:06 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 11:57:06 [info] [Callbacks] Initializing VM event callbacks...
2026-03-05 11:57:06 [error] [Callbacks] Swift VM addon not available for callbacks
2026-03-05 11:57:07 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 11:57:09 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 11:57:13 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 12:08:17 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 12:08:18 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 12:08:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 12:08:25 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 12:42:06 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-05 13:53:40 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:53:40 [info] [Callbacks] Initializing VM event callbacks...
2026-03-05 13:53:40 [error] [Callbacks] Swift VM addon not available for callbacks
2026-03-05 13:53:41 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:53:43 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:53:47 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:54:17 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:54:18 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:54:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 13:54:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:06:30 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:06:31 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:06:33 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:06:37 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:07:28 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:07:29 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:07:31 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:07:35 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:08:21 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:08:22 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:08:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:08:28 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:09:07 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:09:08 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:09:10 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:09:14 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:10:53 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:10:54 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:10:56 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-05 14:11:00 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 07:51:10 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-06 07:53:37 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 07:53:37 [info] [Callbacks] Initializing VM event callbacks...
2026-03-06 07:53:37 [error] [Callbacks] Swift VM addon not available for callbacks
2026-03-06 07:53:38 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 07:53:40 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 07:53:44 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 08:08:36 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 08:08:37 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 08:08:39 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 08:08:43 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 09:08:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 09:08:25 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 09:08:27 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 09:08:31 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:30:53 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:42:11 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:42:12 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:42:14 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:42:18 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:47:21 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:47:22 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:47:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:47:28 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:48:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:48:21 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:48:23 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:48:27 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:54:30 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-06 11:54:38 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 11:54:38 [info] [Callbacks] Initializing VM event callbacks...
2026-03-06 11:54:38 [error] [Callbacks] Swift VM addon not available for callbacks
2026-03-06 12:10:16 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:10:17 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:10:19 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:10:23 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:12:46 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:12:47 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:12:49 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:12:53 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:14:12 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:14:13 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:14:15 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:14:19 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:15:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:16:47 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:33:25 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:34:28 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:34:29 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:34:31 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:34:36 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:35:30 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:35:31 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:35:33 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:35:37 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:36:49 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:36:49 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:36:50 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:36:52 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:36:56 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:40:23 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-03-06 12:40:25 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:40:25 [info] [Callbacks] Initializing VM event callbacks...
2026-03-06 12:40:25 [error] [Callbacks] Swift VM addon not available for callbacks
2026-03-06 12:41:14 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:41:23 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:41:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:41:26 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:41:30 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:43:19 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:43:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:43:22 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:43:26 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:46:48 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:46:49 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:46:51 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:46:55 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:06 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:33 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:33 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:34 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:36 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:48:40 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:49:03 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:49:04 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:49:06 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:49:10 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:51:20 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:51:22 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:51:24 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 12:51:28 [warn] [startVM] VM not supported (win32/arm64), skipping
2026-03-06 15:19:56 [warn] [startVM] VM not supported (win32/arm64), skipping

Steps to Reproduce

try using cowrk and it does not work

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Claude 1.5354.0 (9a9e3d) 2026-04-29T01:14:34.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_