Environment Strings.

%USERPROFILE%Returns the location of the profile for the current user.
%WINDIR%Returns the location of the OS directory
%TEMP%Return the default temporary directories for applications that are available to users who are currently logged on. Some applications require TEMP and others require TMP.
%TMP%Returneturn the default temporary directories for applications that are available to users who are currently logged on. Some applications require TEMP and others require TMP.
%SYSTEMROOT%Location of the Windows root directory
%SYSTEMDRIVE%Returns the drive containing the Windows root directory (i.e., the system root).
%HOMEPATH%Returns the full path of the user's home directory. This variable is set based on the value of the home directory. The user's home directory is specified in Local Users and Groups.
%HOMEDRIVE%Returns which local workstation drive letter is connected to the user's home directory. This variable is set based on the value of the home directory. The user's home directory is specified in Local Users and Groups.
%APPDATA%Returns the location where applications store data by default.
%ALLUSERSPROFILE%Returns the location of the All Users Profile
%RECENT%The file system directory that contains shortcuts to the user's most recently used documents.
%COOKIES%The file system directory that serves as a common repository for Internet cookies.
%DESKTOPDIRECTORY%The file system directory used to physically store file objects on the desktop (not to be confused with the desktop folder itself).
%FAVORITES%The file system directory that serves as a common repository for the user's favorite items.
%HISTORY%The file system directory that serves as a common repository for Internet history items.
%INTERNET_CACHE%The file system directory that serves as a common repository for temporary Internet files.
%LOCAL_APPDATA%The file system directory that serves as a data repository for local (nonroaming) applications.
%MYDOCUMENTS%The file system directory used to physically store a user's common repository of documents.
%PROGRAM_FILES%The Program Files folder.
%SYSTEM%The Windows System folder.
%SCRIPTS%The Scripts folder.