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List of Environment Variable found on Windows

Environment variables are a set of named values that affects the way running processes will behave on a computer depending on the variable stored. The environment variable with a standard name can designate the particular location on a computer system - this may vary from one computer system to another.

Default Values on Microsoft Windows

Variable Windows XP/Vista/7/8
%ALLUSERSPROFILE% and %PROGRAMDATA% C:\Documents and Settings\All Users

C:\ProgramData
%APPDATA% C:\Documents and Settings\{username}\Application Data

C:\Users\{username\AppData\Roaming
%COMPUTERNAME% {computername}
%COMMONPROGRAMFILES% C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)% C:\Program Files (x86)\Common Files
%COMSPEC% C:\Windows\System32\cmd.exe
%HOMEDRIVE% c:
%HOMEPATH% \Documents and Settings\{username}
%LOCALAPPDATA% C:\Users\{username}\AppData\Local
%LOGONSERVER% \\{domain_logon_server}
%PATH% C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths}
%PATHEXT% .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.WSF;.WSH

.com;.exe;.bat;.cmd;.vbs;.vbe;.js;.jse;.wsf;.wsh;.msc
%PROGRAMDATA% %SystemDrive%\ProgramData
%PROGRAMFILES% %SystemDrive%\Program Files
%PROGRAMFILES(X86)% %SystemDrive%\Program Files (x86) (only in 64-bit version)
%PROMPT% Code for current command prompt format. Code is usually $P$G
%PSModulePath% %SystemRoot%\system32\WindowsPowerShell\v1.0\Modules\
%PUBLIC% %SystemDrive%\Users\Public
{Drive}:\$Recycle.Bin C:\Recycle.Bin
%SystemDrive% c:
%SystemRoot% The Windows directory, usually C:\Windows, formerly C:\WINNT
%TEMP% and %TMP% %SystemDrive%\Documents and Settings\{username}\Local Settings\Temp

%SystemDrive%\Users\{username}\AppData\Local\Temp
%USERDOMAIN% {userdomain}
%USERNAME% {username}
%USERPROFILE% %SystemDrive%\Documents and Settings\{username}

%SystemDrive%\Users\{username}
%WINDIR% C:\Windows

Source: http://en.wikipedia.org/wiki/Environment_variable

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