"program not found" by shell plugin with Tauri v2 on Windows

[vivid mantle]

I'm trying to execute a simple echo Hello with the shell plugin with Tauri v2 on Windows. This command needs to be executed when the program starts in the Rust side, so I've tried this:

This is the run function at lib.rs file.

pub fn run() {
    tauri::Builder::default()
        .plugin(tauri_plugin_shell::init())
        .invoke_handler(tauri::generate_handler![greet])
        .setup(|app| {
            let shell = app.shell();

            let output = tauri::async_runtime::block_on(async move {
                shell
                    .command("echo")
                    .args(["-c", "Hello"])
                    .output()
                    .await
                    .unwrap()
            });

            if output.status.success() {
                println!("Result: {:?}", String::from_utf8(output.stdout));
            } else {
                println!("Exit with code: {}", output.status.code().unwrap());
            }
            Ok(())
        })
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}

Just trying to recreate what is in the docs. But after I learn how to use the shell plugin, I will use it to open an external program (not a sidecar) with the start /b command in Windows.

To give more context, here's my capabilities/default.json file:

{
  "$schema": "../gen/schemas/desktop-schema.json",
  "identifier": "default",
  "description": "Capability for the main window",
  "windows": ["main"],
  "permissions": [
    "shell:allow-open",
    "shell:allow-execute",
    "shell:allow-spawn",
    "shell:allow-kill",
    {
      "identifier": "shell:allow-execute",
      "allow": [
        {
          "name": "exec-echo",
          "cmd": "echo",
          "args": ["/c", "Hello"],
          "sidecar": false
        }
      ]
    }
  ]
}

The problem

When I open the program, the error on the image is shown.

Am i doing something wrong? Is a Windows specific thing?