Variable

Windows XP

 %ALLUSERSPROFILE%

C:\Documents and Settings\All Users

 %APPDATA%

C:\Documents and Settings\{username}\Application Data

 %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}

 %PATH%

C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths}

 %PATHEXT%

.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.WSF;.WSH

 %PROGRAMFILES%

C:\Program Files

 %PROGRAMFILES(X86)%

C:\Program Files (x86) (only in 64-bit version)

 %PROMPT%

Code for current command prompt format. Code is usually $P$G

 %SYSTEMDRIVE%

C:

 %SystemRoot%

The Windows directory, usually C:\Windows, formerly C:\WINNT

 %TEMP% and %TMP%

C:\Documents and Settings\{username}\Local Settings\Temp

 %USERNAME%

{username}

 %USERPROFILE%

C:\Documents and Settings\{username}

 %WINDIR%

C:\Windows

 %PUBLIC%