idiomaic_result_registry.rs

fn get_registry_value(key_path: &str) -> Result<String, io::Error> {
    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
    let key = hklm.open_subkey(key_path)?;

    let value: String = key.get_value("my_key")?;
    Ok(value)
}