MyCodex

MyCodex is an MVP launcher for the Microsoft Store ChatGPT app on Windows. The Store package is still named OpenAI.Codex; MyCodex starts its packaged ChatGPT app with Chromium proxy flags and per-process proxy environment variables.

Scope

• Launches the installed Store package app\ChatGPT.exe directly.
• Adds --proxy-server=http://127.0.0.1:7897 by default.
• Sets HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, and NO_PROXY only on the launched ChatGPT process.
• Waits for the Codex resources\codex.exe app-server child process and verifies that it inherited the proxy environment variables.
• Refuses to launch over an already running ChatGPT.exe by default, because startup flags only reliably apply to a fresh process.

Usage

Build:

cargo build

Build a release executable:

cargo build --release

Install for the current user:

.\target\release\mycodex.exe install

This copies the running executable to:

%LOCALAPPDATA%\MyCodex\MyCodex.exe

It also creates a current-user Start Menu shortcut:

%APPDATA%\Microsoft\Windows\Start Menu\Programs\MyCodex.lnk

The shortcut launches MyCodex.exe launch and uses the Microsoft Store app\ChatGPT.exe icon. Running install again overwrites the installed executable, refreshes the shortcut, and removes the legacy Codex++.lnk shortcut if present.

Preview the direct launch command without launching ChatGPT:

cargo run -- launch --dry-run

Launch with the default local proxy:

cargo run -- launch

Launch with a custom proxy:

cargo run -- launch --proxy http://127.0.0.1:7890

Launch a specific ChatGPT executable directly:

cargo run -- launch --chatgpt-exe "C:\Program Files\WindowsApps\OpenAI.Codex_26.707.3748.0_x64__2p2nqsd0c76g0\app\ChatGPT.exe"

The legacy option name --codex-exe remains available as an alias.

Launch without proxy environment variables, keeping only Chromium --proxy-server:

cargo run -- launch --no-env

In direct mode this also removes inherited HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, NO_PROXY, and their lowercase variants from the launched process.

Launch without checking whether app-server inherited proxy environment variables:

cargo run -- launch --no-env-check

Enable remote debugging for inspection:

cargo run -- launch --remote-debugging-port 9229 --remote-allow-origins http://127.0.0.1:9229

Pass extra ChatGPT/Electron arguments after --:

cargo run -- launch -- --some-electron-flag=value

If ChatGPT is already running and you intentionally want to skip the fresh-process guard:

cargo run -- launch --allow-existing-instance

After installation, the installed launcher can be run directly:

%LOCALAPPDATA%\MyCodex\MyCodex.exe launch

Current Limitations

• Direct mode discovers the installed package with Get-AppxPackage -Name OpenAI.Codex and starts app\ChatGPT.exe, falling back to the legacy app\Codex.exe when needed. Pass --chatgpt-exe if discovery fails or the package layout changes.
• Direct mode still depends on the Store app accepting direct execution of app\ChatGPT.exe.
• It does not modify app.asar or files under C:\Program Files\WindowsApps.
• It does not write registry environment values or change the global Windows proxy.