Flutter 术语'；打开'；未识别为cmdlet的名称

我试图打开模拟器，但VSCode告诉我：

open : The term 'open' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path 
was included, verify that the path is correct and try again.
At line:1 char:1
+ open -a simulator
+ ~~~~
    + CategoryInfo          : ObjectNotFound: (open:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

---

PowerShell的搜索路径与

bash

和

sh

不同。要从macOS上的PowerShell打开模拟器，您需要：

/usr/bin/open-a模拟器

为什么会被否决？