Windows environment variables: TEMP and TMP

As Raymond Chen points out, the values of %TEMP% and %TMP% are silently converted to short name (aka 8.3) format, if possible.

The value of these two variables is assigned to the value %USERPROFILE%\AppData\Local\Temp in the registry key HKEY_LOCAL_MACHINE\SOFTWARE\DefaultUserEnvironment

See also C:\Users\username\AppData\Local\Temp