[BUG]

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?

On Windows, Claude Code creates project memory folders using the drive letter
as uppercase (e.g., "C--Users-..."). However, Claude Code cannot recognize
these folders and fails to load project memory.

The folder name must start with a lowercase drive letter (e.g., "c--Users-...")
to be recognized correctly. This means project-specific CLAUDE.md files and
memory are silently ignored when the folder was auto-generated with an uppercase
drive letter.

This is reproducible on Windows 11 with drives C:\ or E:\ etc.

What Should Happen?

Claude Code should either:

1. Always generate project folder names with lowercase drive letters on Windows, or
2. Perform a case-insensitive match when looking up project folders.

Currently, renaming the folder manually from "C--Users-..." to "c--Users-..."
fixes the issue, but users should not have to do this manually.

Error Messages/Logs

Steps to Reproduce

1. Use Claude Code on Windows 11 with a project on the C:\ or E:\ drive.

1. Open a project folder, e.g.: C:\Users\gokmu\Desktop\my-project

1. Claude Code automatically creates a memory folder at:

C:\Users\gokmu\.claude\projects\C--Users-gokmu-Desktop-my-project\
(note: uppercase "C--")

1. Add a CLAUDE.md file inside that folder with project-specific instructions.

1. Run Claude Code again in the same project.

1. Observe that Claude does NOT load the project memory / CLAUDE.md.

1. Manually rename the folder from:

C--Users-gokmu-Desktop-my-project
to:
c--Users-gokmu-Desktop-my-project

1. Run Claude Code again — project memory is now loaded correctly.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.119 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_