[BUG] Windows 11, Claude Desktop version 1.x Error: RPC error -1: SDK version 2.1.260 not verified

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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?

Steps already tried: enabled HypervisorPlatform, created .verified file, deleted and re-downloaded VM files, started CoworkVMService manually

I tried to reinstall claude deskstop, followed all suggested troubleshooting steps but this error keeps coming .

Failed to start Claude’s workspaceRPC error -1: SDK version 2.1.260 not verified at /mnt/.virtiofs-root/shared/c/Users/Yogeswari/AppData/Local/Packages/Claude_pzs8sxrjxfjjc/LocalCache/Roaming/Claude/claude-code-vm/2.1.260/.verified

### What Should Happen?

Cowork workspace starts successfully

### Error Messages/Logs

```shell
Failed to start Claude’s workspaceRPC error -1: SDK version 2.1.260 not verified at /mnt/.virtiofs-root/shared/c/Users/Yogeswari/AppData/Local/Packages/Claude_pzs8sxrjxfjjc/LocalCache/Roaming/Claude/claude-code-vm/2.1.260/.verified
```

### Steps to Reproduce

Environment:

Windows 11
Claude Desktop version 1.49585.0.0
SDK version 2.1.260

Steps to Reproduce:

Install Claude Desktop on Windows 11
Open Claude Desktop and click Cowork
Error appears: RPC error -1: SDK version 2.1.260 not verified at /mnt/.virtiofs-root/shared/c/Users/.../claude-code-vm/2.1.260/.verified

Fixes Already Attempted:

Manually created .verified file — error changed but persisted
Enabled HypervisorPlatform via PowerShell — was Disabled
Deleted claude-code-vm folder and let Claude re-download VM files
Started CoworkVMService manually — shows Running but workspace still fails
Changed Cowork files folder path in Settings
Full uninstall + reinstall of Claude Desktop
Multiple PC restarts

Current State:

CoworkVMService is Running
.verified file exists (64 bytes)
rootfs.vhdx and smol-bin.vhdx exist in vm_bundles\claudevm.bundle
Workspace still fails with mount/verification errors

Expected: Cowork workspace starts successfully
Actual: Workspace consistently fails

### Claude Model

None

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

Claude Desktop version 1.49585.0.0

### Platform

Anthropic API

### Operating System

Windows

### Terminal/Shell

PowerShell

### Additional Information

_No response_

Start by reproducing the failure from the Cowork entry point on Windows 11, then inspect the ClaudeVMService startup and the claude-code-vm/2.1.260/.verified path mentioned in the report. Compare the verification and mount behavior with the listed VM bundle files and service state. Done means the Cowork workspace starts successfully without the RPC verification error.

Written by the indexing model from the issue text.