为什么“Set-Item”不能在Windows 7 PowerShell上运行?

我正在尝试在我的Raspberry Pi 2上安装Windows 10 IoT。PowerShell文档告诉我要放入:

Set-Item WSMan:\localhost\Client\TrustedHosts -Value <minwinpc>

但是,当我把它放到我的Windows 7 PowerShell中, 出来了:

 At line:1 char:54 + Set-Item WSMan:\localhost\Client\TrustedHosts -Value <minwinpc> + ~ The '<' operator is reserved for future use. + CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException + FullyQualifiedErrorId : RedirectionNotSupported 

我该如何解决?

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