
CODE: [Copy to clipboard]2,以文件判断:reg query HKCU\Software\WinRAR\Compression /v DefFolder>nul 2>nul||安装程序.exe
CODE: [Copy to clipboard]方法很多,根据自己的需要选择if not exist "C:\Program Files\WinRAR\WinRAR.exe" 安装程序.exe
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