常用：
    %USERPROFILE% =C:\Users\用户名
    %SystemRoot% =C:\WINDOWS
    %SystemDrive% =C:
    %APPDATA% =C:\Users\用户名\AppData\Roaming
    %LOCALAPPDATA% =C:\Users\用户名\AppData\Local
    %windir% =C:\WINDOWS
    %Path% =C:\Windows\system32;C:\Windows;
    %ProgramData% =C:\ProgramData
    %ProgramFiles% =C:\Program Files
    %ProgramFiles(x86)% =C:\Program Files (x86)

    其他：
    %ALLUSERSPROFILE% =C:\ProgramData
    %CommonProgramFiles% =C:\Program Files\Common Files
    %CommonProgramFiles(x86)% =C:\Program Files (x86)\Common Files
    %CommonProgramW6432% =C:\Program Files\Common Files
    %COMPUTERNAME% =MyPC
    %ComSpec% =C:\WINDOWS\system32\cmd.exe
    %HOMEDRIVE% =C:
    %HOMEPATH% =\Users\用户名
    %LOGONSERVER% =\MicrosoftAccount
    %OS% =Windows_NT
    %ProgramW6432% =C:\Program Files
    %PUBLIC% =C:\Users\Public
    %TEMP% =C:\Users\用户名\AppData\Local\Temp
    %TMP% =C:\Users\用户名\AppData\Local\Temp
    %USERDOMAIN% =MyPC
    %USERNAME% =用户名