使用Go创建注册表项/字符串

I was following this document to create a key/string in windows registry with this code snippet:

package main

import (
    "golang.org/x/sys/windows/registry"
    "log"
)

func main() {

    k, err := registry.OpenKey(registry.CURRENT_USER, `Software\Microsoft\Windows\CurrentVersion\Audio`, registry.QUERY_VALUE)
    if err != nil {
        log.Fatal(err)
    }
    k.SetStringValue("xyz", "blahblah")
    err = k.Close()
    if err != nil {
        log.Fatal(err)
    }
}

but nothing happens, without any errors. Edit (clarification): It doesn't work, in any circumstances.