Installing extensions on Windows fails due to lack of "unzip" command support

[cj-radcliff]

What happened?

The flutter plugin for Gemini CLI will not install because by default Windows doesn't support unzip on the command line. Original bug filed on Flutter Extension here: https://github.com/flutter/gemini-cli-extension/issues/77

However, even if a third party unzip command is added, it still fails. The file exists on the hard drive, and can be installed from the file system, but the command to automatically install fails.

What did you expect to happen?

The command to install the plugin should not depend on any tool not included in Windows 11 by default, or should be included in the installation instructions.

Client information

Client Information

Run gemini to enter the interactive CLI, then run the /about command.

> /about
CLI Version: 0.7.0
Git commit: f28ffaa3
Model: gemini-2.5-pro
Sandbox: no sandbox
OS: win32 (Windows 11 home)
Auth Method: OAuth

</details>

### Login information

Google account (personal) login

### Anything else we need to know?

_No response_

[cj-radcliff]

Note, this doesn't seem to be particular to flutter, as it seems to behave the same with mysql extension as well.

[bdybSoftware]

as requested by @sethladd I am adding my results from https://github.com/flutter/gemini-cli-extension/issues/77:

Microsoft Windows [Version 10.0.19045.6332]
(c) Microsoft Corporation. Tüm hakları saklıdır.

C:\Users\xxxxx>npm install -g @google/gemini-cli@latest

changed 571 packages in 2m

148 packages are looking for funding
  run `npm fund` for details

C:\Users\xxxxx>gemini extensions install https://github.com/gemini-cli-extensions/firebase
Extensions may introduce unexpected behavior.
Ensure you have investigated the extension source and trust the author.
This extension will run the following MCP servers:
  * firebase (local): npx -y firebase-tools@latest experimental:mcp
This extension will append info to your gemini.md context using FIREBASE.md
Do you want to continue? [Y/n]: y
Extension "firebase" installed successfully and enabled.

C:\Users\xxxxx>gemini extensions install https://github.com/gemini-cli-extensions/flutter
unzip:  cannot find either 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionb0hcnh/win32.flutter.zip' or 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionb0hcnh/win32.flutter.zip'.zip.
Failed to clone Git repository from https://github.com/gemini-cli-extensions/flutter

C:\Users\xxxxx>gemini extensions install https://github.com/gemini-cli-extensions/mysql
unzip:  cannot find either 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionk9Npkf/win32.x64.mysql.zip' or 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionk9Npkf/win32.x64.mysql.zip'.zip.
Failed to clone Git repository from https://github.com/gemini-cli-extensions/mysql

C:\Users\xxxxx>gemini extensions install https://github.com/gemini-cli-extensions/postgres
unzip:  cannot find either 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionpWD8vl/win32.x64.postgres.zip' or 'C:/Users/xxxxx/AppData/Local/Temp/gemini-extensionpWD8vl/win32.x64.postgres.zip'.zip.
Failed to clone Git repository from https://github.com/gemini-cli-extensions/postgres

C:\Users\xxxxx>gemini extensions install https://github.com/gemini-cli-extensions/nanobanana
tar: Error opening archive: Failed to open ''C:\Users\xxxxx\AppData\Local\Temp\gemini-extensionGbW35K\nanobanana-release.tar.gz''
Failed to clone Git repository from https://github.com/gemini-cli-extensions/nanobanana

[chrstnb]

Believe this is fixed in the latest release! Thank you for reporting and helping repro! Please re-open if not!

[sethladd]

Latest means 0.8?