Windows: CLAUDE_CODE_GIT_BASH_PATH not recognized even when file exists

Description

Claude Code native installation fails to recognize the CLAUDE_CODE_GIT_BASH_PATH environment variable on Windows, even though the bash.exe file exists at the specified path and the environment variable is correctly set.

Environment

• OS: Windows 11 24H2 (64-bit)
• Language: Japanese (ja-JP)
• Git Bash version: GNU bash, version 5.2.37(1)-release (x86_64-pc-msys)
• Bash location: C:\Program Files\Git\bin\bash.exe

Steps to Reproduce

1. Install Git for Windows from https://git-scm.com/downloads/win
2. Set environment variable: CLAUDE_CODE_GIT_BASH_PATH=C:\Program Files\Git\bin\bash.exe
3. Close all terminals and open a new one (tried CMD, PowerShell, and Administrator PowerShell)
4. Attempt to install Claude Code

Attempted Solutions

All of the following approaches failed with the same error:

• ✗ C:\Program Files\Git\bin\bash.exe (with spaces)
• ✗ C:\PROGRA~1\Git\bin\bash.exe (8.3 short path format)
• ✗ C:\Program Files\Git\usr\bin\bash.exe (alternative location)
• ✗ Set as User environment variable
• ✗ Attempted to set as System environment variable (with admin rights)
• ✗ Tested in CMD, PowerShell, and Administrator PowerShell
• ✗ PC restart

Verification

The bash.exe file exists and is executable:

PS> Test-Path "C:\Program Files\Git\bin\bash.exe"
True

PS> & "C:\Program Files\Git\bin\bash.exe" --version
GNU bash, version 5.2.37(1)-release (x86_64-pc-msys)

PS> [System.Environment]::GetEnvironmentVariable('CLAUDE_CODE_GIT_BASH_PATH', 'User')
C:\Program Files\Git\bin\bash.exe

Error Message

Claude Code was unable to find CLAUDE_CODE_GIT_BASH_PATH path "C:\Program Files\Git\bin\bash.exe"

Expected Behavior

Claude Code should recognize the CLAUDE_CODE_GIT_BASH_PATH environment variable when it points to a valid bash.exe file.

Additional Context

• The environment variable is visible in PowerShell after terminal restart
• The file exists and is executable from PowerShell
• Multiple path formats have been tested without success
• This appears to be specific to how Claude Code validates or reads the environment variable on Windows