====== MSCmd ======
  * http://ss64.com/nt/syntax-variables.html
  * http://www.binbert.com/blog/2010/09/default-environment-variable-values-of-windows-7-xp/


^ Variable                                   ^ Windows XP \\ --- \\ Windows Vista/7                                                                                                                                                 ^
| ''%ALLUSERSPROFILE%'' (''%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}//'' \\ --- \\ ''\Users\//{username}//''                                                                                                       |
| ''%LOCALAPPDATA%''                         | Not available \\ --- \\ ''C:\Users\////{username}////\AppData\Local''                                                                                                                |
| ''%LOGONSERVER%''                          | ''\\//{domain_logon_server}//''                                                                                                                                                      |
| ''%PATH%''                                 | ''C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;//{plus program paths}//'' \\ --- \\ ''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''                                                                  |
| ''%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'' \\ --- \\ ''C:\Windows''                                                                                        |
| ''%TEMP% and %TMP%''                       | ''C:\Documents and Settings\//{username}//\Local Settings\Temp'' \\ --- \\ ''C:\Users\//{username}//\AppData\Local\Temp''                                                            |
| ''%USERDOMAIN%''                           | //{userdomain}//                                                                                                                                                                     |
| ''%USERNAME%''                             | //{username}//                                                                                                                                                                       |
| ''%USERPROFILE%''                          | ''C:\Documents and Settings\//{username}//'' \\ --- \\ ''C:\Users\//{username}//''                                                                                                   |
| ''%WINDIR%''                               | ''C:\Windows''                                                                                                                                                                       |
| ''%PUBLIC%''                               | \\ --- \\ ''C:\Users\Public''                                                                                                                                                        |
| ''%PROGRAMDATA%''                          | Only available in Windows Vista and newer versions \\ --- \\ ''C:\ProgramData''                                                                                                      |
| ''%PSModulePath%''                         | \\ --- \\ ''%SystemRoot%\system32\WindowsPowerShell\v1.0\Modules\''                                                                                                                  |


===== Escape =====
  * http://stackoverflow.com/a/33868784/1108919