[BUG] Edit and Write tools automatically convert files to UTF-8

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?

When using Claude code in PhPStorm the Edit tool converts Wndows-1251 to UTF-8 and then the whole file is messed up.

What Should Happen?

The encoding of the file should not be converted(not only when using 1251).

Error Messages/Logs

Steps to Reproduce

1.Create PHP file with Windows-1251 or other encoding.
2.Ask Claude code to make some changes in it.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Version: 2.0.32

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_